Hello Anna,
Tax Types and Tax Authorities are the only mappings that need to be done 
.
Please, note that the only tax types used by SAP are the ones in the range 001~099. The other tax types (e.g. 501) are used by other BSI functionality, like garnishment and benefits calculation. These tax types should not be mapped, otherwise the sync tax data tool will try to create these tax type in SAP system.
Best Regards,
Felipe.