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You will NOT be able to claim a dependent without having tax identification for that dependent.
What you may do now
- apply for ITIN using form W7 and attach your tax return to that application.
The IRS will assigned the date you main as your filing date - so it will not be late,
but will process ITIN application first - and only after that will start processing your tax return.
Meanwhile a you have only one day left - you may file an extension request to gain additional time .
Yes - that is possible to file without children and amend your tax return later adding qualified dependents.
But please be aware - if your children qualify for SSNs - you will need to apply to the SSA and get SSNs assigned .