HUB testing is the controlled launch period during which the IRS tests the electronic filing system by receiving and processing a limited number of tax returns before the official e-file opening. During this time, some returns may be accepted early, which can impact refund timing for certain clients. In this article, we’ll explain when HUB testing typically occurs, how the IRS selects returns for testing, what you can and can’t do during this period, and how early acceptance may affect refunds—including special rules for returns claiming the Earned Income Tax Credit (EITC) or Additional Child Tax Credit (ACTC).
When does HUB testing start?
IRS HUB testing usually starts in January, during the first week or two before the official e-file opening. The exact timing varies each year, but this controlled launch period gives the IRS time to test its electronic filing system before the season begins. We will notify you in the TaxSlayer Pro message center when the IRS announces the e-file open date and when HUB testing begins.
How many returns does the IRS include in the controlled launch?
The IRS does not publish or commit to a set number of returns they will test each year. Instead of processing the full volume of early submissions, the IRS selects a small test batch of returns during HUB testing to validate system readiness and ensure accurate, secure transmission. Most returns submitted early will wait in a queue until the e-file season officially opens.
Can I choose which returns get selected for HUB testing?
No. TaxSlayer Pro has no control or influence over what transmitted returns the IRS randomly chooses to process during HUB testing. The IRS uses random selection to ensure that testing reflects real-world conditions and system performance under typical filing scenarios. This approach helps verify that all participating software can handle returns accurately and securely in an environment most similar to the filing season. You should transmit returns as you normally would, with the understanding that there is no guarantee a particular return will be selected for HUB testing.
Can I change and retransmit a return during HUB testing?
No. As with any transmitted return, before taking the next steps, you must wait until it is acknowledged with an acceptance or a rejection. HUB testing returns are treated the same as live IRS submissions, so it’s important to double-check for accuracy before transmitting. If a return is accepted, no further action is needed. If rejected, review the reject codes provided, correct the issues, and retransmit the return.
If my client’s return is selected for IRS HUB testing, will they get their refund sooner?
It depends on the credits claimed on their return. The PATH Act of 2015 mandates that the IRS does not issue refunds on returns that include the Earned Income Tax Credit (EITC) or the Additional Child Tax Credit (ACTC) before February 15. If your client’s return is selected and does not include those credits, they could receive their refund sooner than they would have if it was transmitted after the official start of e-file.
Returns with a refund that include either the EITC or ACTC will be processed as normal, meaning the refund won’t be issued until February 15 at the earliest.
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