If the deduction is checked on the comprehensive service platform for special VAT invoices, the signature can be confirmed after applying for statistics, and the signature can also be confirmed the next month, and the deduction is successful only after the signature is confirmed.

The solution for failing to sign by checking the deduction statistics is as follows: 1. Log in to the VAT invoice comprehensive service platform again, and click the deduction link. 2. Then click Deduction again to view the statistics. 3. Next, click the application statistics on the right side of the page, and then the progress bar of application statistics will pop up the statistical time. 4. Wait for the statistics to be completed. This process needs to wait for a few minutes, and then click Statistical Query. If not, more statistical queries are needed. 5. Refresh the statistical query several times until the statistics are completed and the report update time is displayed. 6. Pull the page to the right to view the confirmation signature, and then click Confirm Signature. 7. Confirm whether the page pops up, and click OK.