Independent consultant tax calculator
Consulting is where W-2 and 1099 life overlap most: a director consulting on the side, a fractional executive with one W-2 anchor client, a full-time independent with a spouse on payroll. The estimator below is preset for the commonest case — a solid W-2 salary plus real consulting income — because the interaction is where the math gets interesting: side income stacks on top of your salary’s bracket, W-2 wages eat the Social Security wage base first (shrinking the 12.4% piece of SE tax at higher salaries), and your paycheck withholding counts against the total.
That last fact is the consultant’s cleanest planning tool: withholding is treated as paid evenly through the year no matter when it happens. Bump your W-4 withholding in October and it retroactively covers Q1 — a lever pure freelancers don’t have. Details in the W-2 + 1099 page.
Preset: example W-2 salary + consulting side income
How it works
- Open this page — the estimator is already set up for "Independent consultant tax calculator".
- Enter your expected 2026 income and business expenses. Estimates update as you type.
- Add a W-2 job, kids, or last year’s tax if they apply — the safe-harbor math handles the rest.
- Read off your quarterly payment and the remaining IRS deadlines. Nothing you typed leaves your device.
Consulting-specific mechanics worth knowing
A retainer becomes income the day it lands in your account if you bill cash-basis — the December retainer covering next Q1’s work belongs to this year’s taxes and this year’s quarterly math. Reimbursed expenses billed at cost are a wash in principle, but if a client’s 1099-NEC reports the gross including reimbursements (they often do), deduct the expenses explicitly so you aren’t taxed on airfare. Subcontracting overflow to another consultant makes you the 1099-NEC filer once you pay them over $2,000 in 2026 — collect a W-9 up front.
Consulting is squarely a specified service trade (SSTB) for QBI: full 20% deduction below the 2026 thresholds ($201,775 single / $403,500 joint taxable income), phased to zero above them. For a high-salary employee consulting on the side, the salary alone can push taxable income into the phase-out — meaning the side income may get no QBI benefit. The calculator applies the basic rule and flags the threshold zone.
Good to know
- Bill through an LLC? The IRS disregards a single-member LLC entirely — nothing about your Schedule C, SE tax, or the numbers here changes. It’s liability paperwork, not tax planning (until an S-corp election, which is).
- International clients paying by wire issue no forms; your invoices are the record and the income is fully taxable.
- Track the safe harbor with intent: consultants’ incomes swing, and 110% of a known number (last year’s tax) beats guessing at 90% of an unknown one.
Frequently asked questions
My employer already withholds a lot — do I owe quarterlies on side consulting?
Run it above: enter salary, withholding from your last pay stub (projected to year-end), and consulting profit. If withholding covers all but $1,000 of the combined bill, no estimates are required. Salaried withholding rarely stretches over serious side income though — the consulting sits in your top bracket plus 15.3% SE tax, and none of it was in your employer’s withholding tables.
Should my spouse’s income be in here?
Filing jointly, yes — the brackets, thresholds and the safe-harbor AGI test all run on the joint return. Use the spouse-wages field (it appears when you pick married-joint); their withholding goes in the withholding box along with yours.
Can I deduct my home office if I also have an employer office?
For the consulting business, yes — if the space is used regularly and exclusively for consulting and it’s the principal place of that business. Your employee job is irrelevant to the consulting side’s home office (and employee home-office deductions are gone from federal returns anyway). The exclusive-use test is the one that fails in practice: a den that’s also the family TV room doesn’t qualify.