If you file single and you don’t have W2 income sources or other complexities with your tax situation you could consider using the Estimated Quarterly Tax sheet to help you track how much you need to set aside.
If that won’t work because you have a more complex tax situation that the tool is built for I’d recommend actually transferring money to a separate savings account if you have one to set money aside for tax payments. That way you know you’ll have the money when it’s due vs just leaving it in your business or personal checking account where it could end up being spent.
There isn’t a “liability” type for categories, only income, expense, and transfer.
I’d consider the payment to the IRS to be an expense (but not one you can write off against your business to reduce your tax liability) and any transactions associated with savings/transferring money as a “transfer”
Set aside money in savings account from checking account = transfer
Move money back to checking when tax payment is due so it’s available to pay via ACH transfer = transfer
Money going to IRS = expense
If not, I would recommend just paying close attention to the balance of the account that you plan to pay the tax out of to ensure it never dips below X amount with X being the estimated amount you need to pay in taxes.
Here’s another thread on estimated tax liability categorization you want to review or chime in on
I would recommend using two transactions.
The contractor paycheck would be Income type, which would probably be an increase to your checking account. This transaction would happen automatically via Tiller’s feed.
You would also make a manual transaction to add to a Tax Liability Account. This transaction would not be the same amount as the paycheck, since it is unlikely that the whole paycheck would be paid to taxes. I hope not!
When you pay your taxes, you would add a manual transaction to reduce the Tax Liability account, since the tax is no longer due.
This method would give you a quick way to see how much Contractor income you have and an estimate on how much tax is due from that income.
Perhaps the accountant experts on these boards can provide more details.