No, the amount on line 18 should not be $145 or 0. According to the IRS instructions for Form 1040-X, line 18 should be the amount of your original overpayment as reflected on your Form 1040-SR which appears to have been $4,988. If line 18 is larger than line 17, line 19 will be negative. You will owe additional tax. To figure the amount owed, treat the amount on line 19 as positive and subtract it from the amount on line 11. Enter the result on line 20.
Line 21 on Form 1040-X relates to the amount to be refunded to you. However, given that you added interest to your original return, you will likely owe additional tax, probably close to the amount you initially computed. Therefore, perhaps the best option is to go back to the amended return and check your interest entry.
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