When a Guaynabo estate goes under contract, the property tax figure in the file comes from CRIM, the Centro de Recaudación de Ingresos Municipales. That figure reflects what CRIM has assessed on the parcel. The pool, the added primary suite or the second-story terrace finished a few years ago may not be part of it. Puerto Rico's Código Municipal lets CRIM catch up on that gap, sometimes going back years. The law that allows it also says the tax debt stays attached to the property, whoever holds title.
On a gut-renovated house in Garden Hills or Tintillo Hills, the useful question at closing is whether CRIM's record matches what was actually built. The annual tax amount comes second.
A Tax Roll Drawn From the Air
CRIM's Virtual Appraisal Validation Project began with a 2017 planimetric survey that digitally mapped properties across Puerto Rico. It flagged properties that were missing from CRIM's records or carried incomplete or outdated information. That came to 239,338 new properties and 517,475 properties with home improvements, or 756,843 properties needing validation, according to the CRIM fiscal plan the Financial Oversight and Management Board certified in late June 2026. The plan sorts new homes into models M1 through M6 and improvements into M7 and M8.
Each flagged property goes through the same sequence. A computer produces a recommended value from the planimetric photos. A CRIM appraiser reviews it, the owner is notified and has 45 days to contest the valuation, and only then does CRIM issue an invoice. The value that comes out of this process is not a sale price. The fiscal plan says appraised value under CRIM's system "is grounded in unitario methodology, not in actual market value." That cost-based framework dates to 1957. The Oversight Board treats reforming it as a long-term goal that still requires analysis. It is not a revaluation already in progress.
So the near-term change does not come from a new valuation formula. It comes from CRIM adding improvements to the roll that were never on it.
Where the Improvement Queue Stands This Fall
New properties went first. By November 2025, CRIM had validated 231,301 of the 239,338 newly identified properties, or 96%. When owners started receiving notices, the number of challenges rose. In December 2025 CRIM paused the virtual appraisal process to deal with about 8,291 service sheets, most of them tied to new-property validations.
On March 18, 2026, CRIM finalized a workplan. It aimed to clear about 6,300 service sheets by June 30, 2026 and then start M7 home-improvement validations on July 1, 2026. The fiscal plan counts 510,699 home improvements still waiting for validation going into fiscal year 2027. CRIM is also working with newer imagery. It renewed a data-sharing agreement with Vivienda, received a first set of aerial images in April, and expects the rest of the photography by November 2026.
As of mid-October 2026, we have not found any public confirmation that improvement notices have actually gone out under that workplan. The plan sets the schedule, and that is as far as the public record goes. A separate effort is underway. In July, the AAFAF news page carried a San Juan Daily Star report that the Oversight Board had approved a $2 million pilot for updating CRIM's Digital Cadaster. The approval came in a July 10 letter to CRIM Executive Director Javier García Cintrón, signed by board Executive Director Robert F. Mujica Jr. That pilot centers on identifying ownership information for more than 56,000 properties. It does show CRIM's records being updated on more than one front at once.
In January, El Nuevo Día reported a CRIM administrative order to assign cadaster numbers to, and appraise, structures with different owners that sit on one parcel or under one cadaster number. That matters most on large lots where a guest house or second residence was built over time.
One Renovation, Two Tax Histories
Article 7.041 of the Código Municipal, Ley 107-2020, directs CRIM to keep reviewing real property, including "mejoras no tasadas," meaning unassessed improvements. It also requires CRIM to assess substantial improvements, expansions or reconstructions made to property it has already assessed. Taxes assessed this way can generally reach back up to five years from the date of the assessment. The statute then sets out two different rules for improvements:
"las mejoras, ampliaciones o reconstrucciones sustanciales en propiedades que constituyan la residencia principal del contribuyente, las cuales serán prospectivas a partir de la fecha en que se realice la tasación."
In plain terms, a substantial improvement to a taxpayer's principal residence is taxed going forward from the date CRIM assesses it. The same improvement on any other kind of real property can be taxed retroactively for up to five years from that date. The full text of Article 7.041 on LexJuris is worth reading at the source.
| The same improvement, assessed by CRIM | Principal residence of the taxpayer | Any other real property |
|---|---|---|
| When the added tax begins | From the assessment date forward | Up to five years before the assessment date |
| Typical Guaynabo examples | An owner-occupied family estate | A second home, a furnished rental, a corporate-owned residence |
| Statutory source | Art. 7.041, exception (1) | Art. 7.041, exception (2) |
The split matters a great deal in Guaynabo, where an executive's primary home and an investor's rental can be on the same street. Two identical pool-and-cabana projects finished the same year can produce very different back-tax exposure once CRIM assesses them, depending on how each house was used. The statute ties this to whether the property is "the taxpayer's principal residence." It does not say how a sale, or a change in how the house is used, affects which rule applies. That question belongs with a Puerto Rico attorney or tax professional, not with a listing description.
A related figure helps explain why principal-residence status shows up throughout CRIM's system. The general homestead exoneration covers the first $15,000 of a primary residence's appraised value. The Oversight Board reports that in FY2025 only 41.5% of appraised property value in Puerto Rico was taxable once exemptions and exonerations were applied.
Why the Question Passes to the Buyer
Retroactive billing is only half of it. The other half is who pays.
Under Article 7.057, taxes for the current fiscal year and the five years before it, improvements included, are the first lien on the property. That lien takes priority over other liens, does not have to be recorded in the Registry, and works as a "hipoteca legal a favor del CRIM," a statutory mortgage in CRIM's favor. CRIM's fiscal plan describes how supplementary bills are used when CRIM finds that a property is worth more than its records show, "such as when a home improvement is made," and says those invoices can reach up to five fiscal years back from when the new value was identified.
Article 7.052 adds a deadline. Anyone who acquires property has to notify CRIM of the change in ownership within 30 days, whether or not the deed has been filed with the Property Registry. A buyer who does not notify CRIM can be held responsible for bills issued in the prior owner's name, including bills for periods after the purchase, with interest and surcharges. That buyer also remains responsible for the tax lien that existed on the property at the time of purchase.
Put the three articles together and a renovated estate carries a possible tax liability that no closing document shows. The seller made the improvement. CRIM may assess it after the sale. The lien rules are what put the buyer in the middle.
What the Closing Certifications Actually Show
CRIM's online services offer several property certifications.
- Estado de Cuenta, the account statement showing what has been billed and paid.
- Certificación de Valores, the values CRIM has on record for the parcel.
- Certificación por Todos los Conceptos, a certification covering all categories of debt.
- Negative certifications, confirming that no record or debt exists where that applies.
These are records CRIM issues about its own account for the parcel. The Código Municipal separately directs CRIM to keep reviewing property for "mejoras no tasadas," which assumes some improvements are not yet in its records. The fiscal plan describes supplementary bills being issued after CRIM identifies the higher value. A clean certification today is therefore not evidence that a past addition has been assessed.
The practical check is a comparison. Set the Certificación de Valores next to the renovation history, the permits and the house as it stands, and look for structures that do not appear in CRIM's description. On the owner's side, the CRIM portal accepts electronic requests for real-property assessment and for ownership changes. Ayuda Legal Puerto Rico's guide to CRIM certifications describes the "Tasación de Propiedad" request for new construction, improvements and unregistered properties, and explains that the account is looked up by the property's catastro number. That guide was last updated in March 2024, so confirm its document requirements with CRIM directly.
On a sale, finding the gap early changes who handles it and when. A seller who sees the mismatch before listing can decide how to approach the assessment. A buyer who sees it during due diligence can raise it in the contract and at the closing table instead of after receiving a supplementary bill.
Frequently Asked Questions
Does CRIM's new aerial imagery mean every Guaynabo improvement will be reassessed this year? The fiscal plan schedules M7 home-improvement validations to start July 1, 2026, with 510,699 improvements in the queue entering fiscal year 2027. Vivienda's full photography delivery is expected by November 2026. As of this writing, no public report confirms how many improvement notices have gone out.
Can an owner contest CRIM's valuation of an improvement? Yes. Under the virtual appraisal process, the taxpayer is notified and has 45 days to contest the valuation before CRIM issues an invoice.
Have these articles of the Código Municipal changed since 2020? The text quoted here is the 2020 enactment of Ley 107. We did not confirm whether Articles 7.041, 7.052 or 7.057 have been amended since then, so check the current consolidated text before relying on them.
This post is general information about how Puerto Rico's property tax rules work, not legal, tax or financial advice. Confirm how they apply to a specific property with a Puerto Rico attorney, notary or tax professional.
If you are selling a renovated Guaynabo estate or buying one and want CRIM's file compared against the house before the deed is signed, Aileen Beale Real Estate will coordinate that review with the right professionals as part of a discreet, well-prepared transaction. Request a Private Consultation.
