"Rez.", as Carlos rightly says, must stand for "rezagado", or possibly "rezago". Either way, it means tax that was not paid by the due date, that is overdue. Normally it means tax that should have been paid in the previous tax year.

"INGRESO AÑOS ANTERIORES (REZAGO) [...]
Recaudación neta (efectivamente percibida) por concepto del impuesto predial de ejercicios fiscales anteriores (rezago)"
http://www.osfem.gob.mx/Documentos/Normatividad/06InsForPred...

The basic term for this in English (especially American English) is "back tax(es)":

"back taxes
Definition
Taxes which were not paid when due."
http://www.investorwords.com/378/back_taxes.html

"Back taxes is a term for taxes that were not paid when due. They are typically taxes that are owed from a prior year."
http://en.wikipedia.org/wiki/Back_taxes

"impuesto de traslado de dominio" could be translated as "property transfer tax": tax payable on the transfer of ownership of real estate. It is actually called that in Canada:
http://www.sbr.gov.bc.ca/business/property_taxes/property_tr...

In some US states there is a "real property transfer tax". But "property transfer tax" is a usable international term. Here it is in a document about Europe:

"Can we add back property transfer tax to the fair value of property if this is not included in the IFRS fair value and we are able to avoid the transfer tax through a share deal?
No, the EPRA NAV calculation does not include an adjustment for transfer tax. This is because there are different valuation practices across Europe and in some markets valuers may already reflect the potential transfer tax saving in the valuation"
http://www.epra.com/media/BPR_Additional_Guidance_v1.pdf

But "overdue" could be used instead of "back":

"If you have an outstanding balance or you have received a Notice of Assessment and would like to pay, there are several ways you can pay your overdue Property Transfer Tax"
http://www.sbr.gov.bc.ca/business/property_taxes/property_tr...

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Note added at 6 days (2012-06-29 13:23:51 GMT) Post-grading
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My pleasure, Reed. I'm very glad it was helpful.