Start with gross income, not profit
Qualifying income is not the same as annual profit after expenses, so users need to be careful not to mix the two up.
Guide
How qualifying income works for MTD
Use this page to understand the difference between a simple helper estimate and the fuller qualifying-income picture.
It can include self-employment, property, or both
For many users the practical starting point is combining the gross figures from those sources before checking thresholds.
Some edge cases still need extra care
Special situations, exemptions, or more unusual setups should be checked properly rather than treated as simple threshold maths.
This is why the checker uses likely wording
A practical helper can guide most users well, but it should not pretend to decide every case automatically.
Why this matters
Users often think in terms of profit because that matters for tax bills, but MTD start timing is driven by qualifying income. That is why the site separates the start-date checker from the set-aside estimator.
This site is a practical guide and planning resource. It is not official HMRC software and it is not tax advice.