# Variable debt tokens: tracking a borrower’s growing obligation Aave variable-debt tokens record a borrower’s outstanding principal plus accrued variable-rate interest. Their accounting uses a debt index, and ordinary transfer and approval functions are disabled. They represent an obligation, not a freely transferable asset or a reward earned by the borrower. Evidence: [Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization); [Aave V3 ReserveLogic](https://raw.githubusercontent.com/aave/aave-v3-core/v1.19.3/contracts/protocol/libraries/logic/ReserveLogic.sol) Canonical: https://degreesofsatoshi.com/encyclopedia/variable-debt-tokens/ Published: 2026-10-02 Substantively modified: 2026-10-02 Independently verified by an automated reviewer: 2026-10-02T18:15:18.493Z Data current through: 2026-10-02 AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied. ## Key facts - **Meaning:** The balance represents current variable-rate debt in underlying-asset units. ([Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization)) - **Transfer:** Ordinary ERC-20 transfer and approve functionality is disabled. ([Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization)) - **Index:** Scaled debt accounting uses the reserve’s variable borrowing index. ([Aave V3 ReserveLogic](https://raw.githubusercontent.com/aave/aave-v3-core/v1.19.3/contracts/protocol/libraries/logic/ReserveLogic.sol)) ## A fixed borrowing event can produce a growing obligation Borrowing 100 units creates debt accounting that can later represent more than 100 as interest accrues. The increase follows the reserve’s rate and index rules. The amount needed to repay at a later block can differ from the amount originally borrowed. Use current debt data when preparing repayment. Evidence: [Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization); [Aave V3 ReserveLogic](https://raw.githubusercontent.com/aave/aave-v3-core/v1.19.3/contracts/protocol/libraries/logic/ReserveLogic.sol) ## Credit delegation is different from transferring a debt token Aave exposes borrowing-delegation mechanisms separately from ordinary token transfer. Delegating borrowing power is an authorization decision under protocol rules, not a way to send an existing debt balance to an unsuspecting address. Inspect the approved delegatee and allowance in the actual implementation. A non-transferable token can still participate in a system with powerful delegated permissions. Evidence: [Pool](https://aave.com/docs/aave-v3/smart-contracts/pool); [Aave Docs Glossary](https://www.aave.com/docs/resources/glossary) ## Debt and collateral can move in different units A debt denominated in one asset can become harder to support if its value rises relative to the collateral or if accrued interest increases the obligation. The debt-token balance is one input to risk calculations. Oracle prices, collateral thresholds and available liquidation mechanisms also matter. Evidence: [Pool](https://aave.com/docs/aave-v3/smart-contracts/pool); [Reserve](https://www.aave.com/docs/aave-v3/concepts/reserve) ## Questions ### Can I get rid of a loan by transferring its debt token elsewhere? Not through an ordinary token transfer. The cited variable-debt implementation disables that functionality; debt reduction follows the protocol’s repayment and liquidation rules. Evidence: [Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization); [Pool](https://aave.com/docs/aave-v3/smart-contracts/pool) ## Claims and scope ### variable-debt-tokens-quick-answer Aave variable-debt tokens record a borrower’s outstanding principal plus accrued variable-rate interest. Their accounting uses a debt index, and ordinary transfer and approval functions are disabled. They represent an obligation, not a freely transferable asset or a reward earned by the borrower. Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null} ### variable-debt-tokens-fact-meaning Meaning: The balance represents current variable-rate debt in underlying-asset units. Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null} ### variable-debt-tokens-fact-transfer Transfer: Ordinary ERC-20 transfer and approve functionality is disabled. Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null} ### variable-debt-tokens-fact-index Index: Scaled debt accounting uses the reserve’s variable borrowing index. Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null} ## Sources - [Tokenization](https://aave.com/docs/aave-v3/smart-contracts/tokenization) — Aave. Supply receipt and nontransferable debt accounting using interest indexes. Locator: aToken; VariableDebtToken. Retrieved: 2026-10-02T17:03:44.686Z. - [Aave V3 ReserveLogic](https://raw.githubusercontent.com/aave/aave-v3-core/v1.19.3/contracts/protocol/libraries/logic/ReserveLogic.sol) — Aave. Cumulative supply and borrow indexes update accounting over time. Locator: getNormalizedIncome; getNormalizedDebt; updateState. Retrieved: 2026-10-02T17:03:44.467Z. - [Pool](https://aave.com/docs/aave-v3/smart-contracts/pool) — Aave. Collateralization, available liquidity and liquidation operations. Locator: supply; withdraw; borrow; liquidationCall. Retrieved: 2026-10-02T17:03:44.834Z. - [Aave Docs Glossary](https://www.aave.com/docs/resources/glossary) — Aave. Protocol glossary distinguishes APY including compounding from APR and defines lending terms. Locator: APY; Borrow Cap; Credit Delegation; Debt Ceiling. Retrieved: 2026-10-02T17:58:05.650Z. - [Reserve](https://www.aave.com/docs/aave-v3/concepts/reserve) — Aave. Reserve LTV, liquidation threshold, borrow availability, caps and rate parameters. Locator: Key Reserve Parameters; Dynamic Parameters and Governance. Retrieved: 2026-10-02T17:03:44.647Z. ## Revision history - 2026-10-02: First publication after primary-source research and independent automated verification. ## Cite this entry Degrees of Satoshi editorial project. “Variable debt tokens: tracking a borrower’s growing obligation.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/variable-debt-tokens/