Filed supplemental within a year of decision but no backpay

Based on the information provided, you are likely not entitled to backpay because your supplemental claim was for an **increase** on conditions already service-connected, not a **reversal of a prior denial**. The one-year rule for preserving the effective date under 38 CFR 3.2500(h) applies when you are continuously pursuing a claim that was previously denied, reduced, or granted at a lower evaluation; it does not apply to new requests for an increase on a static rating. For an increase, the effective date is generally the date VA receives the claim or the date of entitlement, whichever is later, per 38 CFR 3.400(o)(2). Your 2024 increase claim established a new effective date, so benefits are payable from that point forward, not from your earlier decision. To challenge this, you must file a **Notice of Disagreement (NOD)** on the decision assigning the new effective date, arguing that your worsening symptoms constituted an "informal claim" for an increase prior to your formal filing, potentially leveraging the duty to assist principles from *DeLuca v. Brown*. However, this is a complex argument. Your immediate actionable step is to obtain your claims file via a FOIA request to review the exact rationale, then consult with a Veterans Service Organization or accredited attorney to determine if an appeal is warranted, as you have one year from the *increase* decision to contest the effective date. **This information is for educational purposes only and is not legal or medical advice; consult with an accredited VA claims agent or attorney for guidance specific to your case.**