The short answer: Year-end tax planning for businesses isn't complicated — but it's time-sensitive. Several of the most valuable moves only work if you execute them before December 31. Prepaying expenses, timing income, purchasing equipment, setting up a retirement plan, and evaluating your entity structure can collectively save thousands. January is too late for most of these.
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If you're on a cash-basis accounting method (which most small businesses are), you can deduct expenses in the year you pay them — not the year they relate to. That means paying January's rent, software subscriptions, or contractor invoices in December creates a deduction on your current-year tax return.
"Pay January's expenses in December and write them off now. Even on a credit card — the IRS says it counts when you charge it, not on the date you pay the credit card balance. Think rent, software, contractors. But don't be cute — not a 3-year supply of logo hoodies."
The credit card rule is important and often overlooked: if you charge an expense to a business credit card in December, you get the deduction in the current tax year even if you don't pay the credit card until January. The payment is considered made on the date of the charge.
⚠ This only applies to legitimate business expenses you would incur anyway. Accelerating ordinary business expenses is fine. Prepaying for years of supplies you won't use is a gray area — the IRS can challenge prepaid expenses that don't have a clear business reason for the timing.
If you haven't issued December invoices yet, consider waiting until January. Delaying when you invoice delays when you receive payment, which delays when you recognize the income for tax purposes.
Critical caveat: this only works if you're on the cash basis of accounting. If you're on the accrual basis, income is recognized when earned — not when cash is received. Holding a December invoice doesn't defer anything on an accrual basis.
Also critical: the payment actually has to arrive in January. A check that arrives December 31 is December income. A payment received January 2 is January income.
With 100% bonus depreciation now permanent (see our full guide at Bonus Depreciation 2025), any qualifying business equipment, software, or improvements purchased and placed in service by December 31 can be fully deducted this year.
"New laptop? Espresso machine? $90K Ford F-250 for your 'construction biz'? Deduct it all this year, as long as you're using it and it's in service by December 31. If it's still in a box or not delivered by January 1st, no dice."
The in-service requirement is absolute. An asset ordered but not delivered by year-end doesn't qualify. An asset delivered but still boxed and uninstalled in your warehouse on December 31 doesn't qualify. It must be ready and available for use in your business.
Business retirement plans — SEP-IRA, SIMPLE IRA, and Solo 401(k) — offer much larger contribution limits than personal IRAs. Setting one up before year-end creates the opportunity to make deductible contributions that reduce your business income.
ⓘ The credit for setting up a new retirement plan is one of the most underused tax benefits for small businesses. If you've never had a retirement plan and you establish one this year, you could get a dollar-for-dollar credit of up to $5,000 on top of the deduction for contributions. This is a credit — meaning it reduces your tax bill by $5,000, not just your taxable income.
If your business had a significantly profitable year and you're operating as an LLC taxed as a sole proprietorship or partnership, an S-Corp election can save substantial amounts in self-employment tax.
The mechanism: as an S-Corp owner-employee, you pay yourself a "reasonable salary" (subject to payroll taxes) and take the remaining profit as a distribution (not subject to self-employment tax). The savings can be thousands or tens of thousands annually for businesses with net income above roughly $50,000–$80,000.
"Big year? It might be time to upgrade from LLC to S-Corp. S-Corps can save thousands in self-employment tax, but it's not for everyone, no matter what the TikTok gurus tell you. Good news: you can retroactively elect S-Corp status for the current year if you act soon."
⚠ The deadline to elect S-Corp status retroactively for the current tax year is typically March 15 of the following year (or the first day of the tax year for a new entity). However, the window to plan for it and ensure you're in compliance (payroll setup, reasonable compensation analysis) is before December 31. The S-Corp election is also not always the right move — additional compliance costs and complexity need to be weighed against the tax savings.
These moves have hard deadlines — January is too late for most of them. Romeo helps business owners identify which ones apply to their situation and execute before the year closes.
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