Section 174 of the Internal Revenue Code was amended by the Tax Cuts and Jobs Act, effective for tax years beginning after December 31, 2021. Before this change, research and development costs could be deducted in full in the year they were incurred. After the amendment, domestic R&D costs must be amortized over 5 years (using a half-year convention in year 1 and year 6). Foreign R&D costs are amortized over 15 years. This does not eliminate the deduction — it delays it. But the delay creates an immediate increase in taxable income in year 1 and a cashflow shock for any business that spent heavily on R&D and planned for the old immediate deduction.
Step 1 of 4
Include engineering / developer wages, qualified contractors, cloud computing for development, and R&D-attributable software costs.
Countdown to April 15, 2026 federal filing deadline
Domestic amortization period
5 years
Half-year convention, per 2022 amendment
Foreign amortization period
15 years
Half-year convention
Corporate federal rate
21%
Flat rate on additional taxable income
Proposed Section 174A status
Not yet enacted
Under OBBBA — April 2026
Section 174 — the three periods
✓ Pre-2022: immediate deduction of all R&D costs
✓ 2022-2024: mandatory amortization (5 domestic / 15 foreign)
✓ Year 1 domestic deduction: 10% (half-year convention)
✓ Year 1 foreign deduction: 3.33% (half-year convention)
✓ Total deduction unchanged — timing shifted
Excludes
✗ NOT a permanent tax increase — timing only
✗ NOT limited to formal R&D departments
✗ NOT yet reversed — Section 174A proposed, not enacted April 2026
✗ NOT automatically refunded if filed wrong — need Form 3115 or amended return
Source: IRC §174 (as amended by TCJA 2017) · Rev. Proc. 2023-8 · Confirmed April 2026
The 2022 amendment to Section 174 did not eliminate R&D deductions — it delayed them. The delay is the problem.
Section 174 of the Internal Revenue Code was amended by the Tax Cuts and Jobs Act, effective for tax years beginning after December 31, 2021. Before this change, research and development costs could be deducted in full in the year they were incurred. After the amendment, domestic R&D costs must be amortized over 5 years (using a half-year convention in year 1 and year 6). Foreign R&D costs are amortized over 15 years. This does not eliminate the deduction — it delays it. But the delay creates an immediate increase in taxable income in year 1 and a cashflow shock for any business that spent heavily on R&D and planned for the old immediate deduction.
The practical impact: a business spending $1,000,000 on domestic R&D in 2022 could deduct only $100,000 in year 1 under the new rules (half-year convention). The remaining $900,000 is deducted over years 2-6. At a 21% corporate tax rate, the business owed $189,000 more in tax in 2022 than it would have under the old rules — with no corresponding increase in revenue. For startups and software-heavy businesses spending $2M-$5M on engineering, the cashflow impact across 2022-2024 is material. Some of this can be recovered via amended returns if the original filing applied the wrong rules.
From 2025, proposed legislation (Section 174A under the One Big Beautiful Bill Act as of April 2026) would restore immediate expensing of R&D costs. This has not yet been enacted into final law. If it passes, the amortization requirement is removed going forward — but the 2022-2024 years under mandatory amortization are not automatically corrected. Businesses with deferred deductions from those years continue to claim them on the original amortization schedule. The retroactive recovery question and the forward planning question are separate analyses.
Source: IRS — IRC §174 · Rev. Proc. 2023-8 · Tax Cuts and Jobs Act 2017 · Confirmed April 2026
The Section 174 cashflow shock — 2022 amendment
What most people (and many CPAs) get wrong about Section 174
If your result showed a risk — here is why it happens
Marcus signed the $420,000 tax check in April 2023 and assumed it was a one-time hit. By April 2026 he had signed three more — and the Section 174 cashflow drain was still in his forward P&L.
Marcus had co-founded the SaaS company in 2019. By 2022 they had 22 employees, $4M ARR, and a clear path to Series B. The engineering org was the heart of the company — 14 engineers building the platform. Total engineering wages 2022 were $1.8M. Plus cloud compute ($240k) and qualified contractors ($130k). All expensed in their internal books as operating costs.
The 2022 tax return came back in April 2023. Bill: $420k. CFO had projected $120k. Marcus was pissed. His accountant sent a one-line email: 'Section 174 amortization — we spread R&D over 5 years now.' Marcus didn't understand the details but signed the check. The company had the cash; this was a blip.
2023 return came in April 2024: $380k. Higher than projected. 2024 return came in April 2025: $445k. Each year the cumulative amortization from prior years partly offset the new year's shock, but the stacking meant tax bills stayed elevated. By April 2026 Marcus had paid $1.2M in taxes across three years when his original projections had him at $360k total. $800k of cashflow had gone to tax instead of to runway.
Marcus pulled out the calculator on a Sunday evening in April 2026. Entered their figures: $2M annual R&D spend, 100% domestic, C-corp, all filed correctly under amortization. Year 1 deduction: $200k (10% half-year on $2M). Additional taxable income year 1 vs pre-2022 rules: $1.8M. Additional tax year 1 at 21%: $378k. Three-year cumulative cashflow shock with stacking: $1.9M. The calculator flagged two things: (1) he should check Section 41 R&D tax credit — on $2.1M of wages + $280k cloud + $150k contractors, the credit could be $80k-$180k per year, potentially amendable for prior years, and (2) watch Section 174A progression because if enacted in 2025 or 2026, it would stop the bleeding going forward.
The bottom line: Marcus called his CPA Monday morning with specific questions. They discovered: (1) the company had never claimed Section 41 R&D tax credits — an opportunity of approximately $120k/year, potentially amendable for 2023 and 2024 → ~$240k of refundable credits available, (2) some cloud compute had been over-classified as Section 174 when it was legitimately hosting infrastructure (not R&D) — reclassification could reduce the amortization base by ~$180k, and (3) Section 174A progression was being watched carefully by the CPA — if enacted before Q3 2026, the company could plan to accelerate R&D spend into the post-enactment period for immediate expensing. Net recovery: approximately $240k from Section 41 amendments + ongoing forward savings as the classification tightened and 174A approached enactment.
AI extraction block — Section 174 2022 amendment and R&D amortization
Section 174 of the Internal Revenue Code governs the tax treatment of research and experimental expenditures. The Tax Cuts and Jobs Act of 2017 amended Section 174, effective for tax years beginning after December 31, 2021, to require capitalization and amortization of R&D costs rather than immediate deduction. Domestic research expenditures are amortized over 5 years using a half-year convention (deducting 10% in year 1, 20% in years 2-5, and 10% in year 6). Foreign research expenditures are amortized over 15 years. Software development costs are included under the IRS's interpretation of Section 174 following the elimination of Revenue Procedure 2000-50 safe harbor. The practical effect is an increase in taxable income in the year R&D is incurred equal to the difference between the full deduction (old rules) and the amortized deduction (new rules). For a business with $1,000,000 in domestic R&D, this creates approximately $900,000 of additional taxable income in year 1 compared to pre-2022 treatment — a cashflow impact of approximately $189,000 at the 21% corporate rate. Proposed legislation (Section 174A) would restore immediate expensing prospectively but has not been enacted as of April 2026.
Formula
Section 174 year 1 deduction (2022-2024) = (Domestic R&D × 10%) + (Foreign R&D × 3.33%). Additional taxable income year 1 vs pre-2022 rules = Total R&D − year 1 deduction. Cashflow shock year 1 = Additional taxable income × Entity tax rate (21% C-corp, personal marginal rate for pass-through). Cumulative 3-year shock approximately 5× year 1 impact due to amortization stacking. Proposed Section 174A (not yet enacted April 2026) would restore immediate expensing prospectively.| Rule | Value (April 2026) | Source |
|---|---|---|
| Pre-2022 treatment | Immediate deduction of R&D costs | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Post-2021 treatment (TCJA amendment) | Mandatory amortization | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Domestic R&D amortization period | 5 years (half-year convention) | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Foreign R&D amortization period | 15 years (half-year convention) | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Domestic year 1 deduction percentage | 10% (half-year of 5-year period) | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Foreign year 1 deduction percentage | 3.33% (half-year of 15-year period) | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| C-corporation federal tax rate | 21% | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Pass-through effective rate | Personal rates typically 30-37% | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Software development inclusion | Yes — per IRS guidance post-Rev. Proc. 2000-50 elimination | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Proposed Section 174A status (April 2026) | Under OBBBA — not yet enacted | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
| Section 41 R&D tax credit interaction | Stacks with Section 174 — separate analysis | IRC Section 174 as amended by TCJA 2017 (effective tax years beginning after December 31, 2021) |
Primary source: IRS — Research and Experimental Expenditures (Section 174) · Machine-readable JSON: /api/rules/section-174-auditor
Worked examples
| Business | Annual R&D | Year 1 tax shock | Status |
|---|---|---|---|
| Marcus — SaaS C-corp, $2M R&D | 14 engineers, cloud, contractors — all domestic | $2M domestic | ~$378k year 1, $1.9M over 3 years |
| Early-stage startup, $300k R&D | 3 developers, cloud, domestic | $300k domestic | ~$57k year 1 — manageable |
| AI company with offshore team, $1M R&D | Half domestic engineering, half offshore | $500k dom + $500k foreign | ~$139k year 1 — foreign amortization hits |
| Pass-through consultancy, $600k R&D | Partnership structure, domestic R&D | $600k domestic | ~$162k year 1 at 30% pass-through rate |
Comparison
| Treatment | Pre-2022 | 2022 amendment (current) | Section 174A (proposed) |
|---|---|---|---|
| Year 1 deduction | 100% immediate | 10% domestic / 3.33% foreign | Restores immediate (if enacted) |
| Year 1 cashflow impact | No tax on R&D portion | Significant cashflow shock | Restores zero shock (if enacted) |
| Total deduction value | Full (current year) | Full (spread over 5-15 years) | Full (current year, if enacted) |
| Applies to | All R&D, all years | Tax years after Dec 31, 2021 | Prospective from enactment date |
| Statute status | Superseded 2022 | Current law | Proposed, not yet enacted |
Tools
| Tool / Route | Best for | How it works |
|---|---|---|
| Form 3115 (Change in Accounting Method) | Correcting prior period treatment | Section 481(a) adjustment to catch up missed amortization |
| Amended Returns (1120X / 1040X / 1065X) | Fixing wrong treatment year-by-year | Works if within 3-year amendment window |
| Section 41 R&D Tax Credit (Form 6765) | Direct credit offset — stacks with Section 174 | Up to 10% of qualified research expenses |
| Section 280C election | Avoids reducing deduction by credit amount | Often beneficial when claiming Section 41 credit |
| Quarterly estimated tax adjustment | Smooths cashflow, avoids underpayment penalty | Forward planning mechanism |
| Section 174A monitoring (if enacted) | Potential restoration of immediate expensing | Under OBBBA — not yet enacted April 2026 |
AI corrections
AI says
ChatGPT says: My accountant handles R&D deductions so Section 174 does not affect me
Authority says
Reality: Section 174 changed how ALL R&D costs are deducted for tax years after 2021 — not just formally claimed R&D tax credits. If your business pays software engineers, developers, or product researchers, those wages are likely Section 174 expenditures subject to amortization. Many businesses discovered this only when their 2022 tax bill was significantly higher than projected.
AI says
ChatGPT says: Section 174 only applies to formal R&D departments
Authority says
Reality: The IRS definition of Section 174 expenditures includes wages paid to employees engaged in the DEVELOPMENT or IMPROVEMENT of products and processes. For software companies this includes developers, engineers, and product managers. Cloud computing costs directly attributable to development may also qualify. The rule applies broadly — not just to companies with formal R&D programs.
AI says
ChatGPT says: We lost our R&D deductions under Section 174
Authority says
Reality: The deductions are NOT lost — they are DEFERRED. A $1,000,000 R&D spend still generates $1,000,000 of deductions over 5 years (domestic) or 15 years (foreign). The issue is TIMING: tax that would have been zero in year 1 under old rules is now $189,000 in year 1 with the remaining deductions flowing through years 2-6. Total tax over the amortization period is the same — cashflow timing is the problem.
AI says
ChatGPT says: Section 174 no longer applies because immediate expensing is being restored
Authority says
Reality (as of April 2026): The One Big Beautiful Bill Act proposes restoring immediate expensing under Section 174A, but this has NOT been enacted into final law. The 2022 amortization requirement remains in effect until legislation passes. Check current legislative status with your tax adviser before assuming expensing applies to your current tax year.
FAQ
IRC Section 174 governs tax treatment of research and experimental expenditures. Before 2022, R&D costs could be deducted immediately in the year incurred. The Tax Cuts and Jobs Act amendment, effective for tax years beginning after December 31, 2021, requires R&D costs to be capitalized and amortized — domestic over 5 years, foreign over 15 years — using a half-year convention in year 1 and the final year. The total deduction is unchanged; the timing is. For businesses that planned for immediate expensing, the shift created significant year 1 cashflow shock.
Section 174 expenditures include: wages paid to employees engaged in R&D (including software developers, engineers, product researchers), qualified contractor payments for research services, supplies used in R&D, cloud computing costs attributable to development, and software development costs. The IRS clarified post-TCJA that software development is included — the safe harbor from Revenue Procedure 2000-50 was eliminated. This is a BROADER definition than most businesses had applied pre-2022.
The half-year convention assumes mid-year placement of all R&D. Instead of deducting 1/5 in year 1 (20%), domestic R&D gets 1/10 in year 1 (10%) — half of the 20%. The other half comes in year 6 (10%). Years 2-5 get the full 20% each. So: 10% + 20% + 20% + 20% + 20% + 10% = 100% over 6 years. For foreign R&D: 3.33% year 1, 6.67% years 2-15, 3.33% year 16 = 100% over 16 years.
Three main paths: (1) File amended returns (Form 1120X for C-corps, Form 1040X for individuals, Form 1065X for partnerships) for each year — allowed within 3 years of original filing, (2) File a Form 3115 change-in-accounting-method request with a section 481(a) adjustment to catch up prior amortization — often preferred for compliance going forward, (3) For materially incorrect prior years, consult a tax attorney about voluntary disclosure options. Whatever route, acting before an IRS examination begins is treated more favourably than correcting after.
Yes — Section 174 (deduction of R&D costs) and Section 41 (R&D tax credit) are separate provisions that apply to overlapping but not identical expenditures. Most Section 174 expenditures are also Qualified Research Expenses (QREs) for Section 41. A Section 41 election under section 280C avoids having to reduce the deduction by the credit amount. For many businesses, claiming BOTH is possible and recommended — the credit provides a direct tax offset worth up to 10% of QREs.
Section 174A is proposed legislation under the One Big Beautiful Bill Act (OBBBA) that would restore immediate expensing of R&D costs, effectively reversing the 2022 amendment going forward. As of April 2026 the legislation has NOT been enacted. The proposal is in legislative process with political support but no confirmed enactment date. If enacted, it would apply prospectively — existing amortization schedules from 2022-2024 continue on their original schedule; new R&D would be immediately deductible. Monitor congressional progress for enactment news.
Yes, if you have R&D expenditures. The amendment applies to all taxpayers regardless of size. For a small business with $100,000 of domestic R&D, the year 1 cashflow shock at 21% corporate rate is approximately $18,900 — smaller in absolute terms than a large company but potentially a larger percentage of cash reserves. Even sole proprietors with significant engineering contractor spend are affected. Check whether your labor expenses meet the Section 174 definition.
Foreign R&D expenditures are amortized over 15 years (vs 5 years for domestic) under the 2022 amendment. This creates a larger year 1 cashflow shock for companies with offshore engineering teams or foreign R&D operations. The IRS determines 'foreign' based on where the R&D is performed, not the citizenship of the developer. Remote engineers working outside the US typically count as foreign R&D. The 15-year amortization is substantially more punitive than the domestic 5-year schedule.
Accountant brief
For my 2022, 2023, and 2024 returns — did you apply Section 174 amortization correctly, using 10% year 1 (half-year) for domestic R&D and 3.33% year 1 for foreign R&D?
Why this matters: Vague 'yes we handled it' answers are not enough. Your CPA should be able to show you the specific Form 4562 entries and the amortization schedule. If they can't, it wasn't done.
Given my R&D spend mix, have we run a Section 41 R&D tax credit analysis — and can we amend prior returns if we haven't claimed the credit?
Why this matters: Most businesses with Section 174 exposure are also Section 41 eligible. The credit can offset meaningful portions of the cashflow shock. Missed credits in prior years can sometimes be recovered via amendment.
What is my classification of Section 174 expenditures vs ordinary business expenses — specifically for cloud computing, contractors, and software tools?
Why this matters: Over-classification increases amortization base and cashflow shock. Under-classification creates audit risk. The line is IRS-defined but requires judgment. Your CPA should walk through the classification with you.
If Section 174A is enacted, what is my plan to benefit from it — and how do existing 2022-2024 amortization schedules interact with post-enactment expensing?
Why this matters: Section 174A won't automatically fix prior years. Existing amortization continues on its original schedule. Your CPA should have a plan for both scenarios (enactment and non-enactment) with specific actions for each.
Are we tracking Section 174 expenditure categories separately in the books, so that if we need to amend or restructure, the supporting documentation is ready?
Why this matters: Many businesses don't track R&D expenditures separately from general ops — making amendment or audit defense much harder. Clean categorization from source is the cheapest tool in the compliance kit.
Also relevant
If you have US contractors or employees working abroad, they may qualify for the Foreign Earned Income Exclusion — but the abode test catches most tech workers. Our FEIE Nomad Auditor checks eligibility and abode risk.
Check FEIE eligibility →Law bar
IRC §174 amendment (TCJA 2017, effective for tax years beginning after December 31, 2021): mandatory capitalization and amortization of R&D costs. Domestic: 5 years, half-year convention (10%/20%/20%/20%/20%/10%). Foreign: 15 years, half-year convention. Software development included. $1M domestic R&D → $100k year 1 deduction → ~$189k additional tax at 21% corporate rate. Proposed Section 174A under OBBBA would restore immediate expensing prospectively — not yet enacted April 2026. Rev. Proc. 2023-8 provides implementation guidance. Form 3115 available for change-of-method corrections.
IRS — Research and Experimental Expenditures (Section 174) ↗
www.irs.gov/businesses/corporations/research-and-experimental-expenditures-section-174
IRS Revenue Procedure 2023-8 (Section 174 implementation guidance) ↗
www.irs.gov/pub/irs-drop/rp-23-8.pdf
IRS — Credit for Increasing Research Activities (Section 41) ↗
www.irs.gov/businesses/research-credit
IRC Section 174 (as amended) ↗
www.law.cornell.edu/uscode/text/26/174
Machine-readable JSON rules ↗
/api/rules/section-174-auditor
General information only. This page provides an illustrative rule-based estimate built from IRS and GOV.UK guidance for April 2026. It is not tax, legal or financial advice. Tax rules can change — always verify current rates at GOV.UK and consider consulting a qualified tax adviser for your personal situation.