Calculate exactly how much to set aside for tax on every freelance invoice

The Freelance Tax Shock

The biggest financial mistake new freelancers make is failing to set aside tax on income as they earn it. Without employer withholding, self-employed workers receive gross payments and must self-manage their tax liability — often resulting in devastating year-end bills.

Generic Buffer Rates

As a rough guide, self-employed workers typically set aside 20–30% of gross income for income tax, plus an additional 9–15% for social security contributions or self-employment tax, depending on jurisdiction. This calculator builds your personal buffer rate.

Why Your Deductible Expenses Really Matter

Here is something many freelancers overlook early on: your taxable income is not your gross income. Allowable business expenses — things like software subscriptions, home office costs, or professional development — reduce the figure tax is actually calculated. Even modest monthly deductions can meaningfully lower your buffer requirement over the course of a year. It can help to track these regularly rather than scrambling to recall them at tax time. Many people find that keeping a simple monthly log makes a real difference when filing season arrives.

Building a Buffer That Feels Manageable

One approach is to treat tax as a non-negotiable line in your budget — almost like paying yourself a bill the moment an invoice lands. Setting aside a percentage immediately, before spending anything else, tends to reduce the temptation to dip into funds that are not really yours to keep. This is worth considering especially during quieter months, when lower income can make that discipline feel harder. Small, consistent habits here tend to serve freelancers far better than large, stressful catch-up payments later.

Run it with sensible defaults

Using average monthly gross income of 5,000, estimated income tax rate of 25, self-employment / ni tax rate of 10, monthly deductible expenses of 600, the calculation works out to 1,600.00. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Average Monthly Gross Income, Estimated Income Tax Rate, Self-Employment / NI Tax Rate, and Monthly Deductible Expenses — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

How the math works

This calculator estimates financial outcomes for freelancers and remote workers based on the inputs provided. Results are illustrative projections and may vary based on location, tax jurisdiction, and individual circumstances. This tool does not provide tax, legal, or financial advice. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

Why freelancers need this

Without a fixed salary, pricing decisions compound. A rate set too low today sets the ceiling for the next few years of clients. The calculation here makes the lifetime cost of underpricing visible — which usually changes the conversation with the next client.

What this doesn't capture

Freelance income is lumpy. The calculation assumes steady work; reality includes dry spells, delayed invoices, and client churn. Plan against a pessimistic version of the result, not the central case.