Yes. The forms are free from the IRS, the allowances they use are published, and the calculation is arithmetic. Nothing here is secret.
What you are paying for is not access. It is the allowances being looked up for your county and household, the arithmetic being done the way the IRS worksheet does it, and fifteen pages coming out filled in and consistent with each other. Most people find that part hard to get right on their own, and small mistakes are what get offers sent back.
Go in knowing that most offers are not accepted. In the 2025 fiscal year, taxpayers proposed 38,797 offers and the IRS accepted 5,464: roughly one for every 7 put in.
Two things that figure does not say, because the IRS does not publish them. It is not a pass rate for one group of people, because the offers proposed in a year and the offers decided in it are different piles. And it is not the failure rate of doing it yourself: there is no published split between offers prepared by taxpayers and offers prepared by professionals, so anybody quoting you one has made it up.
What we can tell you is what the money looks like. We charge $99 per tax year. The IRS charges its $205 application fee whether you use us, use a professional, or do it alone. What a professional charges is not published anywhere and varies enormously, so we will not put a number on it. Ask for a fixed fee in writing before you engage anyone, and be wary of anyone charging a percentage of what you save.
If money is tight, Low Income Taxpayer Clinics represent people before the IRS for free or for a small fee, generally for households at or below 250% of the federal poverty level. You are more than welcome to check with one.