You can use the vouchers provided and mail checks to the addresses on the vouchers.

If you want to pay online, which is recommended, you can do so here:

1. For the IRS, go to this website and follow the instructions.
2. For the FTB, go to this website and follow the instructions.

For California S Corps, LLCs and LPs, follow these instructions below.

1. Go to this website.
2. Select your entity type and follow instructions.
3. You can find your entity number and other information by searching for your entity name here or find the info on your voucher.