Taxes Consolidation Act, 1997 (Number 39 of 1997) 653BI. Power to combine forms Any document, including a certificate, notice, notification, form or return, relating to vacant homes tax may be combined with such a document relating to any other tax, charge, levy or duty under the care and management of the Revenue Commissioners and any document so combined may be modified by the Revenue Commissioners accordingly in relation to its application to vacant homes tax and other tax, charge, levy or duty or to vacant homes tax only or to those taxes, charges, levies or duties only, as the case may be.