In The Peoples Republic of Scotland, all primary kids get free lunches now, I think (Primary is aged 4/5 to 11/12). When it was introduced, my son was in P1 or 2. We spoke to the head and asked if we could pay for our son's lunch as we didn't need the freebie. She said there was no way to pay for it: it was free whether you wanted it or not. Crazy. I'm a rampant capitalist, every man for himself and all that but ther…
One state's form of children's medicaid or whatever it is bills a "please pay this amount" each month, but the bill has a note that says "not paying this won't affect your coverage" and the coverage is granted not on whether you paid, but your financial situation. So the end result is the "bill" is actually an optional payment.
At least in the USA, if you ever think you were wrongly given a tax or other financial advantage, you can donate the largess back to the government: https://www.pay.gov/public/form/start/23779454 (yay they take Venmo)
I couldn't find something directly for Scotland, and I know that assuming the UK is the same thing has caused spicy reactions before, but this does exist:
https://www.dmo.gov.uk/responsibilities/public-sector-funds-...