Being here over 180 days makes you a tax resident. You are paying bills here so obviously you’re bringing funds into Thailand. Whether that is through bank transfers or on the back of a donkey is irrelevant to your tax situation.
On the brighter side of things, tax liabilities are only calculated on the amount you brought in, likely the same as the amount you spent.
You can deduct a number of deductibles. There a reference to the list of deductibles in the group about tax rules:
Thailand Tax rules for expats
On top of that, the first 150k (after deductions) is taxed at zero percent. And last best, if taxes have already been paid in USA then the relevant tax (related to the Thai “income”) can be offset.
Very likely your net tax will be zero or near zero.
Note that taxability of income depends on the source of your money. Two factors would be really important for you:
1) If you can demonstrate the money was earned in a year before becoming tax resident (I.e. it was in your bank on
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/2024) then it will not become taxable income in Thailand.
2) If your income originates from US social security then Thailand can not tax it as per the Double Tax Agreement between USA and Thailand.
Further information: Join the group mentioned above.