Your startup might owe taxes for 2026. But you don't have to wait until April 2027 to find out how much.
By reviewing your finances before the year ends, you can estimate your tax liability, identify expenses you may have overlooked, and make smarter decisions about purchases your business already needs.
Most founders think about taxes when it's time to file.
But filing season is mostly about reporting what already happened.
Before the year ends, you may still have opportunities to act.
For example, your startup might need new equipment, software, professional services, or other business purchases. Depending on the circumstances, making those purchases before December 31 could affect your 2026 taxable income.
A year-end review helps answer three questions:
How much taxable income is your company likely to have?
Which legitimate business deductions might you be missing?
Are there expenses worth making before year-end that could reduce your taxes?
The goal isn't to spend money just to avoid taxes. It's to make necessary business decisions with a clearer understanding of their tax impact.
The IRS generally allows businesses to deduct expenses that are ordinary and necessary for their operations.
For startups, common examples include:
| Expense | What founders should know |
|---|---|
| Software and subscriptions | Business-related SaaS, hosting, productivity tools, and other software costs may qualify. |
| Professional services | Accounting, legal, bookkeeping, and consulting fees may qualify, although some formation and transaction costs require capitalization. |
| Marketing and advertising | Advertising campaigns, website promotion, and ordinary marketing expenses are often deductible. |
| Contractors | Payments for legitimate business services are generally deductible, subject to applicable rules. |
| Employee compensation | Salaries and certain benefits may be deductible, with special timing and related-party rules. |
| Computers and equipment | Business equipment may qualify for expensing or depreciation, depending on the asset and applicable elections. |
| Business travel | Qualifying business travel expenses may be deductible with proper documentation. |
| Office and workspace | Business rent, supplies, and eligible workspace costs may qualify. |
| Business insurance | Qualifying insurance premiums may be deductible, subject to timing rules. |
| Startup costs | Certain costs incurred before operations begin have special deduction and amortization rules. |
Not every expense qualifies, and not every qualifying expense is deductible immediately.
Sometimes. But prepaying isn't a guaranteed deduction.
Suppose your startup plans to buy an annual software subscription in December.
If the company uses the cash method of accounting, the payment may qualify for current-year treatment under applicable prepaid-expense rules, including the 12-month rule.
But if the company uses the accrual method, the deduction may depend on when the service is provided and other requirements.
Some expenses must be spread across multiple tax years, even when paid upfront.
The same principle applies to insurance, rent, consulting, and other prepaid services.
Before prepaying, check whether the expense can actually reduce your 2026 taxable income.
Let's say your Delaware C-Corp expects:
Revenue: $300,000
Allowable expenses: $200,000
Taxable income: $100,000
At the 21% federal corporate income tax rate, that's approximately $21,000 in federal income tax, before credits and other adjustments.
Now suppose the company identifies another $10,000 of legitimate deductions that are fully allowable in 2026.
| Before | After | |
|---|---|---|
| Taxable income | $100,000 | $90,000 |
| Federal corporate tax at 21% | $21,000 | $18,900 |
| Potential federal tax savings | $2,100 |
That's $2,100 less in federal corporate income tax.
But remember: spending $10,000 to save $2,100 in taxes is not a good deal unless the company actually needs what it's buying.
This example assumes the additional deduction is fully available in 2026 and ignores state taxes, credits, loss carryforwards, and other adjustments.
You may not owe federal corporate income tax if your company has no taxable income.
But you may still have filing obligations, and documenting legitimate expenses can matter for future tax years.
Startups should also distinguish between operating expenses, organizational costs, capital expenditures, and other transactions. They don't all receive the same tax treatment.
Tax Scan is a year-end tax planning review designed to help founders understand their numbers before the year closes.
The goal is to help your business:
Estimate its potential 2026 tax liability.
Identify possible missed deductions.
Review upcoming purchases and prepayments.
Understand which expenses may qualify for current-year deductions.
See what needs attention before December 31.
Instead of waiting until tax season to discover what you owe, you can start planning now.
April is when many startups file their federal corporate tax returns.
December is when many year-end decisions still need to be made.
Reviewing your books now could help you avoid surprises, make better purchasing decisions, and enter tax season with a clearer picture.
Before 2026 ends, find out what your business could be missing.
Get your Tax Scan with TaxHero AI → send a message in the chatbot
Useful sources:
IRS Publication 583 — ordinary and necessary expenses, startup costs, depreciation.
IRS Publication 538 — accounting methods and the 12-month rule for qualifying prepaid expenses.
IRS Publication 334 — deductible expenses and timing rules.
IRS Form 4562 instructions — depreciation and Section 179.
Tax Scan provides an estimate and identifies items for review. Tax treatment depends on company-specific facts and applicable law. Final filing positions should be verified.
Start by finding out what your company needs to do.
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