October 16, 2025
Buying in Marina Woods is exciting, but that first year of homeownership can come with a surprise: a supplemental property tax bill. If you have never heard of it, you are not alone. Many buyers expect their lender to handle everything, only to find an extra county bill arriving later. This guide explains what it is, when it shows up, how it is calculated, and the simple steps to stay ahead of it. Let’s dive in.
A supplemental tax bill is an extra, prorated property tax bill that results when the county reappraises your home after a change in ownership or completion of new construction. State law sets this reassessment on your closing date, which becomes your new base year value date. The bill is based on the difference between your new taxable value and the prior taxable value. It is in addition to your regular annual tax bill and does not replace it. California Revenue and Taxation Code and El Dorado County explain this process.
After closing, the Assessor mails a Notice of Supplemental Assessment. The county can bill supplemental taxes at least 30 days after that notice. Timing varies by workload and season, so watch your mail. You will still receive your regular annual bill on the normal schedule. See the county’s guidance and estimator tool on the Supplemental Taxes page.
If you close between January 1 and May 31, you may receive two supplemental bills. One covers the remainder of the current fiscal year and the second adjusts the next fiscal year. This is set by state law and is common for winter and spring closings. Review the two-bill rule in RTC section 75.11.
The basic formula is: (new taxable value minus prior taxable value) times the applicable tax rate times the months remaining in the fiscal year divided by 12. El Dorado County prorates based on full months remaining in the fiscal year that runs July 1 to June 30. The county notes that voter-approved special taxes and direct charges that apply to your parcel can be included. You can review parcel details with the Assessor’s Property Information resources.
Say you bought in September. If your market value at purchase is 250,000 and the prior assessed value was 200,000, the difference is 50,000. With a combined tax rate around 1.08 percent and a 9 of 12 month proration, the supplemental tax would be about 50,000 × 1.08 percent × 9/12 = 405. This mirrors the county’s example on its Assessor pages.
Supplemental bills are mailed to you as the property owner. They are not automatically sent to your lender or paid from your impound account. If you want your lender to pay it, you must contact them and arrange it. The Treasurer-Tax Collector explains this in the county’s Property Tax FAQs.
Supplemental taxes are not necessarily prorated in escrow. Address responsibility for any future supplemental bills in your purchase agreement and escrow instructions. If the property sells again before the supplemental bill is finalized, proration among owners may be needed, and you should notify the Auditor’s office. See the county’s Supplemental Taxes page for guidance.
If you qualify for the homeowner’s exemption and it has not already been applied, you can typically claim it on the supplemental assessment. File the exemption with the Assessor within 30 days of the Notice of Supplemental Assessment mailing date. See the Assessor’s Property Information page for forms and steps.
If you disagree with the supplemental value, you can file a formal appeal. The general deadline is 60 days from the mailing date printed on the supplemental assessment notice, or within 60 days of the supplemental tax bill if no notice was received. Pay your bill on time while appealing to avoid penalties. The State Board of Equalization outlines these timelines in its assessment appeals FAQs and the county provides Assessment Appeals resources.
If an adjustment or appeal results in overpayment, the county processes refunds or corrections. Each supplemental bill has its own delinquency date, so rely on the dates printed on your bill. Late payment can trigger penalties and interest. Refer to the county’s Property Tax FAQs.
Marina Woods includes a variety of homes and tax-rate areas. Parcel-specific charges, such as special assessments and direct charges, vary by property. Do not assume there are no additional levies. Verify your parcel’s details using the Assessor’s Property Information tools and any prior tax bills.
A supplemental bill is normal after you buy in Marina Woods, and a little planning goes a long way. Estimate your amount, set expectations in escrow, and watch for your notice so you can act on exemptions or appeals. If you are closing between January and May, budget for the possibility of two bills. For a calm, well-prepared first year of ownership, take the steps above and keep county resources close.
If you are planning a move in or around El Dorado Hills and want clear guidance at every step, reach out to Sankaran and Associates, Inc for a concierge real estate experience tailored to your goals.
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