Home office deductions for consultants: a practical guide

Published December 29, 2025 · 2 min read

Home office deductions explained for consultants, with a worked example, a checklist and the mistakes to avoid.

Why this matters for consultants

Consultants usually bill large amounts irregularly, so setting aside the right share for tax is essential.

Worked example

Here is the calculation with sample figures. Change any number in the Home Office Deduction Calculator to run your own.

Home office deductions: how it works

A simplified home office method multiplies the office area by a fixed rate, up to a cap.

The space usually has to be used regularly and exclusively for business.

A second example with larger figures

Scaling the inputs up shows how the result moves. Percentages stay the same, so the tax grows in proportion to the amount it is applied to.

Using the calculator step by step

1. Open the Home Office Deduction Calculator.
2. Enter your own figures on each numbered line.
3. Set the rate to the one that applies to you. Defaults are examples, not advice.
4. Read the result and the formula below it.

Key terms

Marginal rate

The rate applied to the next unit of income. It decides how much of a raise or a deduction you keep.

Taxable income

Income left after allowances and deductions, on which the tax rates are applied.

Zero rate

A rate of 0% on a taxable supply. Unlike an exemption, the seller can usually still reclaim tax on costs.

Tax credit

An amount subtracted directly from the tax bill, worth its full face value.

Standard rate

The rate that applies to most goods and services unless a specific reduced rate, zero rate or exemption applies.

A quick checklist for consultants

1. Measure the office area.
2. Confirm exclusive use.
3. Compare simplified and actual-expense methods.

Common mistakes to avoid

• Claiming a shared family room.
• Forgetting the area cap.

Frequently asked questions

This article is general information for planning, not tax advice. Rates and rules change; confirm with your tax authority or a qualified adviser.