I forgot to pay my last 2 quarter taxes on my one-person LLC. Do I try to pay it now, or just handle as part of the tax returns?

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It depends. If you plan on filing your tax return now, you can pay with your return. ‌However, if you plan to delay filing, or will be filing an extension, you should make a payment as soon as possible to stop interest from accruing.‌ The IRS calculates interest daily on underpayments.

Here is some more information: What Are the IRS Interest Rates for Late Tax Payments or Refunds?