Originally Posted by BalbC

I think all these yens here and there are going to be annoying.
They are avoiding this on the trains by keeping the cash fares at in 10 yen increments (so raising prices more than the tax increase) as the vending machines can't handle small coins. JR East and some of the private rail companies will do only the actual increase for Suica/Passmo pares, so using cards will be a bit cheaper than cash.