I'm currently making installment payments on 2018 taxes does anyone know if they are being postponed due to COVID -19

[ColeenD3]

Yes.

Federal tax payments have also been deferred, interest and penalty free, for 90 days, until July 15. Individuals and self-employed taxpayers can defer up to $1 million for tax year 2019 federal tax payments. This deferment also applies to tax year 2020 estimated tax payments previously due on April, 15, 2020. Corporations can defer up to $10 million in federal payments.

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[iannaconeg]

So even although this is an installment payment plan I have been already paying on for a 1 year from 2018 taxes you think this still falls under the current deferred payment  plan as well ?

[DeanM15]

I do not see anything that indicates the interest and penalty deferments apply to payment plans begun in previous years. 

You can see more info here. The deadline has been extended for 2019 payments due on April 15th and estimated payments for the first quarter of 2020. I would continue to make payments on your plan if possible.