Claim R&D Tax Credits
The leading R&D tax credits solution
MainStreet takes the guesswork out of R&D tax credits and passes the savings on to you.
Thousands of dollars are waiting, don’t miss your deadline and get started today.

$150M +
Savings claimed (so far)
2,000 +
Startups & SMBs served
$100K +
Our average credit claim

Why MainStreet
Thousands of customers served, Millions in R&D Credits earned, and 0 audits
MainStreet is the no. 1 provider of R&D Credits. We have decades of combined experience that have allowed us to refine a methodology that will provide you peace of mind.
In the unlikely event of an audit, we’ll reimburse you up to $1,000,000 for any accountant fees, penalties, or interest you have to pay to the government due to a MainStreet error.
(PS. None of our companies has needed to use the Guarantee)
Why R&D Tax Credits
Billions left on the table
There are over $100B set aside for R&D tax credits but only a handful are getting claimed. 4,000+ businesses and startups don’t know they’re qualified for R&D Credits.
It’s convoluted but we’re here to do it for you.


Come tax season, you’ll get:

The tax forms needed to file your claim alongside your annual tax return.

A dedicated team of tax specialists, on hand to guide you with the next steps of your claim.

An R&D study prepared by our tax specialists that supports and substantiates your tax credit claim to the IRS.
MainStreet works seamlessly with your CPA
Our team of tax specialists — former accountants at the Big Four — know what your CPA will need:
· Save them time and let them focus on your main filing.
· Easily add your CPA to collaborate on your MainStreet account.
· Send them what they need with the click of a button.

Savings made simple
Sign up for free in just 5 minutes. We search through 200+ credits, finding the ones that best suit your business. Once you qualify, we do the heavy lifting to claim your r&d tax credits and pass the savings on to you.