7 US Deductions and Credits You're Probably Missing in 2026

You spent months getting the Delaware C-corp set up. You closed the round. You shipped the product. Tax planning rarely makes that list, and that is exactly why it quietly drains runway.

For founders who incorporate in the US from somewhere else, India especially, the cost of getting tax wrong is higher than it is for a domestic team. The same income can get taxed twice. Credits go unclaimed because nobody filed the right form. Payroll taxes pile up on a company that is not even profitable yet. None of that is a loophole problem. It is a documentation and timing problem, and it is fixable.

Here are seven deductions and credits worth knowing for 2026, with the current numbers and the catch that usually trips founders up.

Why this matters before year-end, not after

Tax planning works when it runs as a monthly habit, not a year-end scramble. The biggest cross-border win is rarely one giant deduction. It is a disciplined system that captures a dozen smaller benefits across twelve months, so nothing falls through at filing time.

Two rules sit underneath everything below. First, a deduction is only as good as the record behind it. The IRS expects a clear business purpose and a paper trail, not a vibe. Second, credits and exclusions interact, and for founders with income on both sides of a border, that interaction is where money is won or lost. Worth reviewing before you finalize anything.

1. Business mileage

Vehicle expenses get underclaimed because founders forget to track them. For 2026, the IRS standard mileage rate for business use is 72.5 cents per mile, up 2.5 cents from 2025. It applies to a car, van, pickup, or panel truck used for business.

If you or part of your team operate from the US, this covers driving to investor meetings, coworking spaces, customer sites, and demos, as long as the trip is ordinary and necessary for the business. The requirement is a contemporaneous log: date, destination, purpose, miles. Reconstructed-from-memory logs do not hold up. A 1,000-mile business year is a $725 deduction, and it compounds trip by trip.

2. Home office deduction

Founders working from a dedicated space at home often skip this, assuming it is a freelancer thing. If the space is used regularly and exclusively for business, the deduction can cover a share of rent, utilities, internet, repairs, and depreciation.

One cross-border nuance matters here. If you run the company through a US C-corp rather than as a sole proprietor, you usually do not claim this on a personal return. The cleaner route is an accountable plan, where the company reimburses you for the business-use portion of home expenses and deducts it. Same benefit, correct mechanism. Get the structure right and it is defensible. Get it wrong and it is an audit flag.

3. The R&D credit and the payroll tax offset

This is the big one for technical founders, and it is the most overlooked. The federal R&D credit, under Section 41, is a dollar-for-dollar reduction in tax, not a deduction. A common myth is that R&D means lab coats. In reality, software development, engineering iteration, architecture work, and prototyping can qualify under the IRS four-part test.

Here is the part that matters when you are pre-profit: a qualified small business can elect to apply up to $500,000 of the credit per year against payroll taxes instead of income tax. So a startup with no income tax bill can still convert qualifying research spend into a quarterly reduction in Social Security and Medicare payroll taxes. For a company burning most of its runway on engineering salaries, that is non-dilutive cash.

Two things to watch. The election is made on your original, timely filed return, not an amended one, so missing the deadline means missing the year. And only domestic research qualifies, which is the catch that catches India-to-US teams: wages paid to engineers working outside the US generally do not count toward the credit. Map your research spend to where the work physically happens before you assume the number.

4. Foreign tax credit

Founders with cross-border income often pay tax in more than one country on the same dollars. The foreign tax credit exists to stop that double hit. It is claimed for qualifying foreign income taxes, generally on Form 1116, and unused credits can be carried back one year and forward up to ten.

In most cases a credit beats a deduction, because a credit reduces your US tax bill directly rather than just lowering taxable income. This is the single most valuable tool for a founder who is personally taxed both in the US and at home, and it is worth modeling before you decide how to take foreign taxes paid.

5. Retirement plan contributions

Retirement contributions do double duty: long-term savings and a current-year tax reduction. The 2026 numbers rose across the board. The elective deferral limit for 401(k), 403(b), and most 457 plans is $24,500. The total defined-contribution limit, employee plus employer, is $72,000. IRAs sit at $7,500.

Founders who pay themselves through W-2 compensation can use these limits to lower taxable income while building personal savings. If you are 50 or older, catch-up contributions push the ceiling higher still. For a founder finally taking a real salary post-raise, this is one of the cleaner ways to bring the tax bill down.

6. Qualified business expenses

A lot of deductible spend never gets claimed because it is tangled up with mixed personal-and-business charges. Software subscriptions, cloud hosting, professional services, banking and legal fees, bookkeeping, marketing tools, and business travel are all ordinary categories that should be tracked cleanly from day one.

The whole game is documentation. Invoices, receipts, a one-line business purpose, and tidy books are what make a deduction survive scrutiny. Good records also do double duty: they are the same evidence you need to support an R&D claim or prove an expense was ordinary and necessary. Clean books are not admin overhead. They are the asset that unlocks every other item on this list.

7. State and cross-border planning

Federal tax gets all the attention, but state nexus and treaty positioning can move the number just as much. Depending on where the company actually operates, where customers sit, and where the team works, you can pick up filing obligations, withholding rules, and entity-level taxes that change what you actually owe.

This bites hardest when work and reporting are mismatched: US customers, contractors spread across countries, a cofounder still abroad. The fix is to line up where value is created with where it is reported, early, before a state or a treaty question turns into a penalty.

The mistakes that cost the most

Three patterns show up again and again.

Treating tax as a year-end cleanup instead of a monthly operating habit. By December the easy wins are already gone.

Assuming a deduction is automatic because an expense felt business-related. The business purpose and the documentation still have to exist.

Missing the interaction between credits and exclusions on foreign income. The foreign tax credit and the foreign earned income rules affect each other, so cross-border founders should review the full picture before finalizing a return, not after.

What to do this quarter

Set up a monthly checklist that captures mileage, receipts, contractor payments, foreign taxes paid, and retirement contributions. Keep the books current so none of it has to be reconstructed later.

If your company is technical, get R&D eligibility reviewed before year-end. The payroll tax offset is valuable precisely when profits are low, which is exactly when most founders assume tax credits do not apply to them.

We work with cross-border founders running US entities every day, and the pattern is consistent: the runway is not saved by one clever move. It is saved by a system that quietly does the right thing twelve times a year. If you want a second set of eyes on which of these apply to your structure, that is the conversation worth having before filing season, not during it.