Sorry for all the questions today.

On the I-134, question 7:

Do I put how much is in my checking account there? I'm wondering what the point of having my bank letter is if I don't put how much is in my checking account on the I-134 somewhere.

This has to do with income, if your income falls below the poverty line then you use assets like bank accounts to make up the difference.

My income is +40,000 per year, so I just have pay-stubs, letter from employer, and tax returns as evidence, they do not need to see banking data.

Aaaaah ok... that makes sense. I'll leave that line blank and just send the bank letter over to my fiance in case they ask for it. Thanks!