In the interest of full transparency and in line with the U.S. Federal Trade Commission's guidelines:
Some of the links on BillableMath are affiliate links. If you click one and sign up for or buy a product, we may receive a commission. This costs you nothing extra — the price is the same whether or not you use our link.
We only point to tools that are genuinely relevant to the calculator you are using — for example accounting, invoicing, or tax software for freelancers. A commission never changes the math in our calculators, which run on the numbers you enter and nothing else. We aim to keep recommendations useful and independent of whether a product has an affiliate program.
If you ever want to know whether a specific link is an affiliate link, email hello@billablemath.com and we will tell you.