Why do Excel tables not carry down formulas and validations when new rows are added?

This might be caused by a disabled AutoFill setting or because Excel's automatic table behavior has been interrupted.

First, check that the AutoFill feature is enabled. In Excel, go to File > Options, select Proofing, then click AutoCorrect Options. On the AutoFormat As You Type tab, make sure Fill formulas in tables to create calculated columns is checked, then click OK. If this option is disabled, formulas will not automatically populate when new rows are added to a table.

If the setting is already enabled but formulas are still not carrying down, the calculated column rule may have been broken by an accidental edit or override in one of the cells. Clear the formulas in the affected column, enter the correct formula again in the first data cell of that table column, and press Enter. Excel should recognize the column as a calculated column and automatically fill the formula down the entire table, including future rows.

For data validation, make sure the validation is applied to the table column itself rather than to a normal cell range. Select the data cells within the table column, go to Data > Data Validation, and apply the required validation rule. Once the validation is correctly associated with the table column, newly added rows should inherit the same validation automatically. If formulas or validation still fail to carry down after these steps, it may indicate that the range is no longer recognized as a proper Excel Table or that the table has become corrupted, in which case recreating the table may resolve the issue.

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hth

Marcin