diff --git a/contracts/escrow/src/lib.rs b/contracts/escrow/src/lib.rs
index f801412b..1e58c97b 100644
--- a/contracts/escrow/src/lib.rs
+++ b/contracts/escrow/src/lib.rs
@@ -336,7 +336,8 @@ mod contract {
                 mergefi_common::SplitError::SelfPayout => Error::SelfPayout,
                 mergefi_common::SplitError::Overflow => Error::ArithmeticOverflow,
             })?;
-        let treasury: Address = mergefi_common::require_treasury::<DataKey>(&env).unwrap();
+        let treasury: Address = mergefi_common::require_treasury::<DataKey>(&env)
+            .ok_or(Error::NotInitialized)?;
         let token_client = token::Client::new(&env, &escrow.token);
         let contract_address = env.current_contract_address();
 
diff --git a/contracts/maintenance-pool/src/error.rs b/contracts/maintenance-pool/src/error.rs
index bc81b969..c75ca9df 100644
--- a/contracts/maintenance-pool/src/error.rs
+++ b/contracts/maintenance-pool/src/error.rs
@@ -34,4 +34,8 @@ pub enum Error {
     /// `total_deposited` near `i128::MAX`). Returned instead of panicking
     /// under release `overflow-checks = true` + `panic = "abort"`.
     ArithmeticOverflow = 16,
+    /// Recipient basis-point weights do not sum to 10 000 (#484).
+    InvalidSplit = 17,
+    /// A recipient address equals the contract address — self-payout (#484).
+    SelfPayout = 18,
 }
diff --git a/contracts/maintenance-pool/src/lib.rs b/contracts/maintenance-pool/src/lib.rs
index fb2183ea..94115667 100644
--- a/contracts/maintenance-pool/src/lib.rs
+++ b/contracts/maintenance-pool/src/lib.rs
@@ -16,7 +16,7 @@ mod types;
 mod test;
 
 use error::Error;
-use soroban_sdk::{contract, contractimpl, token, Address, BytesN, Env};
+use soroban_sdk::{contract, contractimpl, token, Address, BytesN, Env, Vec};
 use types::{DataKey, Deposit, MaintenancePool};
 
 use mergefi_common::BPS_DENOMINATOR;
@@ -178,11 +178,17 @@ mod contract {
         Ok(())
     }
 
-    /// Admin-only: pays `amount` (minus the protocol fee) out of the pool
-    /// to `recipient` (a maintainer), as authorized off-chain by the
-    /// backend oracle for completed maintenance work. Rejects if the pool
-    /// balance is insufficient.
-    pub fn withdraw(env: Env, pool_id: u64, recipient: Address, amount: i128) -> Result<(), Error> {
+    /// Oracle-authorized: pays `amount` out of the pool, split across
+    /// `recipients` (basis-points weights summing to 10 000) after
+    /// deducting the protocol fee via `mergefi_common::compute_split`
+    /// — the same path escrow and milestones use (#483, #484).
+    /// Rejects if the pool balance is insufficient.
+    pub fn withdraw(
+        env: Env,
+        pool_id: u64,
+        recipients: Vec<(Address, u32)>,
+        amount: i128,
+    ) -> Result<(), Error> {
         if is_paused(&env) {
             return Err(Error::ContractPaused);
         }
@@ -206,13 +212,14 @@ mod contract {
 
         let fee_bps: u32 = mergefi_common::get_fee_bps::<DataKey>(&env)
             .ok_or(Error::NotInitialized)?;
-        let fee = amount
-            .checked_mul(fee_bps as i128)
-            .ok_or(Error::ArithmeticOverflow)?
-            / BPS_DENOMINATOR;
-        let payout = amount
-            .checked_sub(fee)
-            .ok_or(Error::ArithmeticOverflow)?;
+        let payouts =
+            mergefi_common::compute_split(&env, amount, fee_bps, &recipients).map_err(
+                |e| match e {
+                    mergefi_common::SplitError::InvalidSplit => Error::InvalidSplit,
+                    mergefi_common::SplitError::SelfPayout => Error::SelfPayout,
+                    mergefi_common::SplitError::Overflow => Error::ArithmeticOverflow,
+                },
+            )?;
 
         let treasury: Address = mergefi_common::require_treasury::<DataKey>(&env)
             .ok_or(Error::NotInitialized)?;
@@ -231,10 +238,14 @@ mod contract {
         env.storage().persistent().set(&pkey, &pool);
         extend_ttl(&env, &pkey);
 
-        if fee > 0 {
-            token_client.transfer(&contract_address, &treasury, &fee);
+        if payouts.fee > 0 {
+            token_client.transfer(&contract_address, &treasury, &payouts.fee);
+        }
+        for (recipient, share) in payouts.shares.iter() {
+            if share > 0 {
+                token_client.transfer(&contract_address, &recipient, &share);
+            }
         }
-        token_client.transfer(&contract_address, &recipient, &payout);
 
         // Refresh all deposit sub-records on every withdrawal so historical
         // deposit records stay queryable across a long-running pool's lifetime.
diff --git a/contracts/maintenance-pool/src/test.rs b/contracts/maintenance-pool/src/test.rs
index 32b45212..1f1a6f5e 100644
--- a/contracts/maintenance-pool/src/test.rs
+++ b/contracts/maintenance-pool/src/test.rs
@@ -3,7 +3,7 @@
 use super::*;
 use soroban_sdk::{
     testutils::{Address as _, Ledger as _},
-    token, Address, Env,
+    token, vec, Address, Env,
 };
 
 fn create_token<'a>(
@@ -108,7 +108,7 @@ fn test_withdraw_deducts_fee_and_balance() {
     client.deposit(&2u64, &sponsor, &token_addr, &10_000_000_000i128);
 
     let maintainer = Address::generate(&env);
-    client.withdraw(&2u64, &maintainer, &200_0000000i128);
+    client.withdraw(&2u64, &vec![&env, (maintainer.clone(), 10_000u32)], &200_0000000i128);
 
     // 10% fee -> 20_0000000 to treasury, 180_0000000 to maintainer.
     assert_eq!(token_client.balance(&maintainer), 180_0000000i128);
@@ -137,7 +137,7 @@ fn test_withdraw_with_zero_fee_pays_full_amount() {
     client.deposit(&2u64, &sponsor, &token_addr, &10_000_000_000i128);
 
     let maintainer = Address::generate(&env);
-    client.withdraw(&2u64, &maintainer, &200_0000000i128);
+    client.withdraw(&2u64, &vec![&env, (maintainer.clone(), 10_000u32)], &200_0000000i128);
 
     assert_eq!(token_client.balance(&maintainer), 200_0000000i128);
     assert_eq!(token_client.balance(&treasury), 0i128);
@@ -326,7 +326,7 @@ fn test_withdraw_exact_balance_boundary() {
     assert_eq!(err, Err(Ok(Error::InsufficientBalance)));
 
     // Exactly the pool's balance must succeed and drain it to zero.
-    client.withdraw(&7u64, &maintainer, &500_0000000i128);
+    client.withdraw(&7u64, &vec![&env, (maintainer.clone(), 10_000u32)], &500_0000000i128);
     let pool = client.get_pool(&7u64);
     assert_eq!(pool.balance, 0i128);
     assert_eq!(pool.total_withdrawn, 500_0000000i128);
@@ -360,7 +360,7 @@ fn test_interleaved_deposit_withdraw_consistency() {
         assert_eq!(pool.balance, total_deposited - total_withdrawn);
 
         if withdraw_amt > 0 {
-            client.withdraw(&8u64, &maintainer, &withdraw_amt);
+            client.withdraw(&8u64, &vec![&env, (maintainer.clone(), 10_000u32)], &withdraw_amt);
             total_withdrawn += withdraw_amt;
 
             let pool = client.get_pool(&8u64);
@@ -528,7 +528,7 @@ fn test_sweep_cannot_remove_owed_balances() {
 
     // Withdrawal should still work for the full pool balance
     let maintainer_balance_before = token_client.balance(&maintainer);
-    client.withdraw(&1u64, &maintainer, &100_0000000i128); // 10% fee = 10, payout = 90
+    client.withdraw(&1u64, &vec![&env, (maintainer.clone(), 10_000u32)], &100_0000000i128); // 10% fee = 10, payout = 90
     let maintainer_balance_after = token_client.balance(&maintainer);
 
     // Maintainer should receive (100 - 10% fee) = 90
@@ -646,7 +646,7 @@ fn test_recover_withdraw_frozen_before_recoverable_after() {
     client.recover_admin(&new_admin);
     // New admin withdraws successfully (mocked auth enables it)
     env.mock_all_auths();
-    client.withdraw(&42u64, &maintainer, &1_000_000_000i128);
+    client.withdraw(&42u64, &vec![&env, (maintainer.clone(), 10_000u32)], &1_000_000_000i128);
     assert_eq!(token_client.balance(&maintainer), 900_000_000i128); // after 10% fee
 }
 
@@ -908,7 +908,7 @@ fn test_upgrade_preserves_pool_with_multiple_deposits() {
     assert_eq!(client.get_deposit(&246u64, &3u32).sponsor, late_sponsor);
 
     let maintainer = Address::generate(&env);
-    client.withdraw(&246u64, &maintainer, &1_000i128);
+    client.withdraw(&246u64, &vec![&env, (maintainer.clone(), 10_000u32)], &1_000i128);
     let pool_after = client.get_pool(&246u64);
     assert_eq!(pool_after.balance, 5_500i128);
     assert_eq!(pool_after.total_withdrawn, 1_000i128);
@@ -948,7 +948,7 @@ fn test_set_oracle_rotates_oracle_used_by_withdraw() {
     client.deposit(&7u64, &sponsor, &token_addr, &100_0000000i128);
 
     let maintainer = Address::generate(&env);
-    client.withdraw(&7u64, &maintainer, &50_0000000i128);
+    client.withdraw(&7u64, &vec![&env, (maintainer.clone(), 10_000u32)], &50_0000000i128);
 
     // withdraw now requires the rotated oracle's authorization, not the old one's.
     let auths = env.auths();
@@ -986,7 +986,7 @@ fn test_set_treasury_updates_fee_recipient() {
     client.deposit(&253u64, &sponsor, &token_addr, &10_000_000_000i128);
 
     let maintainer = Address::generate(&env);
-    client.withdraw(&253u64, &maintainer, &200_0000000i128);
+    client.withdraw(&253u64, &vec![&env, (maintainer.clone(), 10_000u32)], &200_0000000i128);
 
     // 10% fee lands on the new treasury, none on the old one.
     assert_eq!(token_client.balance(&new_treasury), 20_0000000i128);
diff --git a/contracts/milestones/src/error.rs b/contracts/milestones/src/error.rs
index 7472af37..4269745d 100644
--- a/contracts/milestones/src/error.rs
+++ b/contracts/milestones/src/error.rs
@@ -37,6 +37,10 @@ pub enum Error {
     /// `i128::MAX`). Returned instead of panicking under release
     /// `overflow-checks = true` + `panic = "abort"`.
     ArithmeticOverflow = 21,
+    /// `allocate` was called on a milestone whose deadline has already passed
+    /// (#489). Once past the deadline, sponsors may cancel; allowing further
+    /// allocations would let the admin pre-empt that cancel.
+    DeadlinePassed = 22,
     /// The deadline supplied to `create_milestone` is in the past (issue #491).
     DeadlineInPast = 22,
 }
diff --git a/contracts/milestones/src/lib.rs b/contracts/milestones/src/lib.rs
index 0e03528f..c3f257f2 100644
--- a/contracts/milestones/src/lib.rs
+++ b/contracts/milestones/src/lib.rs
@@ -338,6 +338,17 @@ mod contract {
         if milestone.closed {
             return Err(Error::MilestoneClosed);
         }
+
+        // Reject allocations once the milestone's deadline has passed (#489).
+        // Once `now >= deadline` sponsors can trigger `cancel_milestone_after_deadline`
+        // after the grace period; allowing allocations beyond the deadline lets the
+        // admin pre-empt that cancel by moving remaining_budget into allocations that
+        // the permissionless cancel cannot sweep.
+        let now = env.ledger().timestamp();
+        if now >= milestone.deadline {
+            return Err(Error::DeadlinePassed);
+        }
+
         if milestone.allocations.contains_key(issue_id) {
             return Err(Error::IssueAlreadyAllocated);
         }