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Using your credit

Two Paths to Claim the R&D Credit

An income-tax offset (the default) or a payroll-tax offset (the QSB election). Which path applies depends on your company's tax liability — Mainstreet finalizes the election during the credit study.

Path 1 · Default

Income Tax Credit

For clients with federal income tax liability

Who

Profitable or income-tax-owing clients.

How

Credit reduces annual federal income tax directly.

Form

Form 6765 attached to the annual return (1120 / 1065 / 1040).

Limit

No payroll-side cap. Unused credit carries forward up to 20 years.

Payroll role

None on the filing side — the credit reduces income tax, not payroll tax.

Path 2 · QSB Election

Payroll Tax Offset

For Qualified Small Businesses with no income tax owed

Who

QSBs: under 5 years old with under $5M gross receipts in the current year.

How

Credit offsets employer FICA (Social Security + Medicare portions).

Form

Form 6765 (election) + Form 8974 filed quarterly with payroll.

Limit

$500K per year max payroll offset (post-2022 IRA expansion).

Payroll role

You provide Form 8974 to your payroll provider, who applies the offset against employer payroll taxes each quarter.

Routing signals

Common reasons a client has no federal income tax liability

If a company isn't paying income tax, these are the usual drivers — and strong signals to route to Path 2 (QSB payroll offset).

Pre-revenue

No taxable income yet — early-stage or just launched.

Operating at a loss (NOL)

Current-year expenses exceed revenue.

Prior-year NOL carryforward

Past losses offsetting current-year income.

Outside capital deployed

VC, debt, or founder capital fueling growth burn — common in venture-backed companies.

Pass-through entity

LLC / S-Corp / partnership — income flows to owners; the entity owes no federal income tax. Payroll offset still applies at entity level.

Heavy capex / §179

Bonus depreciation or Section 179 deductions wiping out taxable income.

Understanding credit utilization

What the credit does — and doesn't — offset

✅ Credit DOES offset

Federal income tax from:

✓K-1 income (pass-through)
✓Spouse's W-2 income
✓Investment income (interest, dividends, capital gains)
✓Rental real estate income
✓Other pass-through businesses
✓Schedule C income (consulting, side hustles)

❌ Credit does NOT offset

×W-2 payroll withholding
×Self-employment tax
×Social Security / Medicare (FICA)
×Net Investment Income Tax (NIIT)

Payroll Tax Offset (QSB only)

Qualified Small Businesses can offset employer FICA via Form 941: 6.2% Social Security + 1.45% Medicare = 7.65% of wages.

IRC §41(h) — pre-revenue startup benefit

The Payroll Tax Offset at a glance

$500K

Max annual offset

SECURE 2.0 Act, 2023+

5 Years

Lifetime window

Consecutive tax years

6.2%

Employer SS tax

IRC §3111(a) — offset target

Q1+1

First quarter

Offset applies the year after election

Step-by-step: how the payroll tax offset works

Track QREs during the tax year

Log wages, supplies, and contract research by project. Time-track by employee. Project-level detail is required for audit defense.

Compute the credit on Form 6765

Calculate the ASC (14%) or Regular (20%) credit. Enter the elected payroll offset in Part III — it cannot exceed $500K or your employer SS liability estimate.

File Form 6765 with Form 1120

Must be filed by the original due date plus extensions. A late election means no offset for that year — this is absolute and cannot be amended back.

Q1 of the following tax year

The offset begins on Form 941 for the first quarter after the tax year in which the 6765 election was made — not the same year.

Complete Form 8974 each quarter

Enter the elected credit on Line 1. Calculate available offset vs. SS tax. Carry unused credit to the next quarter's Line 3.

Apply on Form 941, Line 11c

Line 11c reduces the employer SS deposit obligation. Reconcile on Schedule B. Unused credit carries forward within the 5-year window.

Don’t Miss Your Claim Window

Your business can claim R&D tax credits for open tax years — from 2022 through today. That means you may have unclaimed money sitting in prior returns right now.

2022 tax year

2023 tax year

2024 tax year

Book a free discovery call and we’ll identify exactly what you can claim across all open years — at no upfront cost.

Startup Payroll Tax Offset

Businesses less than 5 years old can offset payroll taxes instead of income taxes — up to $500K per year.

Book a free call →