The IRS has been pushing out the second stimulus checks to people’s bank accounts and mail boxes since last week, but the agency has a week and a half left to complete sending out payments before a Jan. 15 deadline set by Congress. (Here’s how to calculate your payment. This is how to track it.)

Although the IRS is moving briskly to hit the cutoff date, it’s unlikely everyone who qualifies for more stimulus money will receive their payment by the middle of the month. And it is not just that the IRS will run out of time. It may run into roadblocks that could hold up your second stimulus check delivery. But knowing where you fall on the IRS payment schedule can give you an idea if you’ll be among the first to get a second stimulus check for up to $600 per person, or near the end of the line. (Remember, some may not get another check at all.)

Keep reading for information about which IRS payment group the agency may sort you in. If you’re wondering what happened to the last-minute push to replace the $600 checks with $2,000 maximum, that’s over unless or until the new Congress takes up a larger stimulus check. Meanwhile, President-elect Joe Biden has already backed a third stimulus check in 2021. This story was recently updated.

Direct deposit has the advantage, but there’s also a catch

People who have their direct deposit information on file with the IRS are in the first group to receive a stimulus check. An electronic transfer of funds is faster and more efficient than mailing a check, which means the IRS can process many more people faster. Many have already received their money through direct deposit, beginning on Dec 29.

On Jan. 4, the IRS turned on its tool to track your second stimulus check online; however, you won’t be able to sign up for or change your direct deposit information. If the IRS does not already have your banking information, you’ll have no choice but to wait for the mail.

Social Security beneficiaries — which way will your check go?

With the first stimulus payment, many people who receive Social Security disbursements who also had direct deposit information on file with the federal government received checks in the first week, though not always the first day.

For the second check, the IRS will automatically send the money through how you regularly receive your benefits, such as direct deposit, Direct Express card or paper check.

Paper checks are coming, but the deadline looms

The IRS began sending the first paper checks in the mail on Wednesday, Dec. 30 (here’s how you can track your stimulus check to your mailbox). That’s much faster than the first time around, but there are still two major limitations you need to know.

The US Treasury can process between 5 million and 7 million paper stimulus checks a week in addition to checks for other federal programs, according to a Government Accountability Office report from June, which means some people will have to wait.

Then there’s this catch. Language in the stimulus bill institutes a cutoff of Jan. 15 for the IRS to send out payments. So anyone who doesn’t receive theirs around the middle of the month will have to claim it this year during tax season. That gives people who sign up for direct deposit a distinct advantage.

The timing then becomes a matter of how soon you submit your taxes for 2020 and how quickly the IRS would be able to process your return. Those two scenarios are influenced by a variety of factors. For example, people who file their returns in February would likely receive their stimulus check money — in the form of a Recovery Rebate Credit — months before people who wait until the April 15 deadline or file an extension.

The first wave of EIP cards will arrive faster this time

EIP debit cards are prepaid Visa cards the IRS may send you instead of a paper check — the envelope will look unmarked, so be careful not to toss out your mail without carefully checking first (this free tracking tool can help). The IRS has said it started sending EIP cards on Dec. 30, a change from the one-month delay in sending this type of payment the first time. The same rules apply as paper checks. If you don’t get yours around Jan. 15, you’ll need to claim it as a Recovery Rebate Credit as part of filing your taxes this year.

Complex situations could hold up your check

For the first check, this category includes people who received a check after June, still haven’t received their full stimulus payment or who didn’t know they needed to complete an extra step. It isn’t clear what would happen if there was a problem during the process and the Recovery Rebate Credit was further delayed. It’s likely the IRS would set a different, later deadline to address clerical errors, like missing stimulus money, and other scenarios. Here are 10 things that could hold up your stimulus check.

If you don’t get the full amount from any stimulus check? Know this

It isn’t always clear how much money the IRS might owe you in the event of an error. We suggest starting with our second stimulus check calculator or the calculator for the first stimulus check and this introduction to how the IRS tabulates your total sum. If the numbers seem lower than they should be, you might want to investigate further.

See if any of these situations could apply to you: Are you missing $500 allotted for your child dependents, or do you pay or receive child support? Are you a tax nonfiler who may be owed a stimulus check (including older adults and people who receive SSI or SSDI)?

If you’re a US citizen abroad or live in a US territory and didn’t receive a check as expected, you may also need to read up on the rules. And a court ruling has made it possible for millions of people who are incarcerated to get a check, even after the IRS changed its interpretation to exclude this group.