Charging tax depends on your business status.
If your business is tax registered, then you must pay tax on your sales. You will pay it to the corresponding authority within the country you're registered.
Each individual or entities circumstances will be different, so the best option is to consult an accountant or financial professional to check what you need to do to comply with the applicable law.
Taxes on Profit Payouts (if using a Merchr Webstore)
Profit payouts are paid exclusive of tax however if you wish to claim the VAT from us in order to pay the relevant authority, you can send us an invoice for the profit amount with VAT added.
Taxes on Product Costs (if using a plugin on an external store)
Merchr product costs include VAT. If you are a tax registered business and wish to claim this back, get in touch with us and we can issue VAT invoices for you to include in your records.