More than 90 million taxpayers have already received a collective $240 billion in stimulus payments — but not all of them have yet received the full amount they are eligible to get.

The Internal Revenue Service has an explanation, at least for some of them.

Married people who filed their returns jointly may receive their stimulus in two separate installments if their tax return includes something called an injured spouse claim — which a taxpayer can file for if part of their tax refund is withheld over a spouse’s past-due debts, such as federal or state taxes, child support or student loans.

In most cases, the IRS said Tuesday, the second portion of the payment will be delivered the way you instructed on your tax return — although it’s possible that one portion will be delivered by direct deposit and the other sent by mail. The second portion could be delayed by a few weeks, according to the agency.

Another batch of economic payments will be issued on Wednesday, which may resolve the issue for some couples. But for those still wondering when the relief payment may arrive, the IRS suggested that both taxpayers on the return use the “Get My Payment” tool using their own Social Security numbers to check payment status.

It’s unclear how many taxpayers are affected or if there are other issues also causing delays. But nearly 7,000 people have found their way to a Facebook group titled Half Stimulus Missing/Received Status to trade frustrations and information.

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Many other Americans — including some who receive Social Security — are still waiting, too.

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Leaders from the House Ways and Means Committee sent a letter to the IRS and Social Security Administration on Monday about delayed payments to people who aren’t required to file a tax return and who receive benefits from Social Security, Supplemental Security Income, the Railroad Retirement Board and Veterans Affairs. The IRS, the letter said, was unable to provide an expected timeline.

“Some of our most vulnerable seniors and persons with disabilities, including veterans who served our country with honor, are unable to pay for basic necessities while they wait for their overdue payments,” the lawmakers wrote.

An IRS spokesman confirmed that the agency doesn’t yet have a date for when those payments might arrive. But those who did file a tax return last year or who registered with the agency’s nonfilers tool for prior stimulus payments should not be affected.