diff --git a/apps/labrinth/src/queue/payout_run/estimate.rs b/apps/labrinth/src/queue/payout_run/estimate.rs
index 6139037102..ca9a2e18e2 100644
--- a/apps/labrinth/src/queue/payout_run/estimate.rs
+++ b/apps/labrinth/src/queue/payout_run/estimate.rs
@@ -2,10 +2,11 @@
 
 use std::collections::HashMap;
 
-use chrono::{Datelike, Months};
+use chrono::{Datelike, Months, NaiveDate};
 use dashmap::DashMap;
 use eyre::{Result, eyre};
 use rust_decimal::Decimal;
+use serde::{Deserialize, Serialize};
 use xredis::RedisPool;
 
 use crate::{
@@ -15,19 +16,20 @@ use crate::{
 
 const REDIS_KEY: &str = "aditude_month_estimate_v1";
 
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct PeriodEstimate {
     pub period: YearMonth,
     pub days: Vec<DayEstimate>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Serialize, Deserialize)]
 pub struct DayEstimate {
-    pub day: u32,
+    pub date: NaiveDate,
     pub raw_estimated_revenue_usd: Decimal,
     pub impressions: u128,
 }
 
+/// Get per-month and per-day estimated ad provider info.
 pub async fn estimate(
     aditude: &aditude::Client,
     redis: &RedisPool,
@@ -93,7 +95,7 @@ async fn fetch_estimates(
 
             let day = date.day();
             days.push(DayEstimate {
-                day,
+                date,
                 raw_estimated_revenue_usd: row
                     .revenue
                     .wrap_err_with(|| eyre!("no revenue data for day {day}"))?,
@@ -107,7 +109,7 @@ async fn fetch_estimates(
     // we have no clue if the Aditude row return order is stable,
     // so for safety sort the days here
     for period in map.values_mut() {
-        period.days.sort_unstable_by_key(|day| day.day);
+        period.days.sort_unstable_by_key(|day| day.date);
     }
 
     Ok(map.into_iter().collect::<DashMap<_, _>>())
diff --git a/apps/labrinth/src/queue/payout_run/mod.rs b/apps/labrinth/src/queue/payout_run/mod.rs
index d0c37c5c2b..4a4fafa2b2 100644
--- a/apps/labrinth/src/queue/payout_run/mod.rs
+++ b/apps/labrinth/src/queue/payout_run/mod.rs
@@ -62,4 +62,84 @@
 //!   epoch)
 //! - the decimal fraction of variance to apply
 
+use chrono::NaiveDate;
+use rust_decimal::{Decimal, dec};
+use serde::{Deserialize, Serialize};
+
 mod estimate;
+
+/// Fraction defining much of the net revenue goes to the platform.
+const PLATFORM_REVENUE_SPLIT: Decimal = dec!(0.25);
+
+/// How input revenue is distributed for a specific day.
+///
+/// This may refer to either estimated or actual revenue.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DayDistribution {
+    pub raw_revenue_usd: Decimal,
+    pub fees_usd: Decimal,
+    pub variance_usd: Decimal,
+    pub sum_adjustments_usd: Decimal,
+    pub net_revenue_usd: Decimal,
+    pub platform_net_revenue_usd: Decimal,
+    pub creator_net_revenue_usd: Decimal,
+}
+
+#[derive(Debug)]
+pub struct PayoutVariance {
+    pub starts_at: NaiveDate,
+    pub frac: Decimal,
+}
+
+#[derive(Debug)]
+pub struct PayoutVariances {
+    pub fracs: Vec<PayoutVariance>,
+    pub default_frac: Decimal,
+}
+
+impl PayoutVariances {
+    pub const ZERO: Self = Self {
+        fracs: Vec::new(),
+        default_frac: Decimal::ZERO,
+    };
+}
+
+/// Compute the [`DayDistribution`] for an input revenue and impressions amount.
+///
+/// This logic may be used on both estimated and actual revenue. For actual
+/// revenue, [`PayoutVariances::ZERO`] should be used, since variance only
+/// applies to estimated days.
+pub fn distribution_for_day(
+    date: NaiveDate,
+    raw_revenue_usd: Decimal,
+    impressions: u128,
+    sum_adjustments_usd: Decimal,
+    variances: &PayoutVariances,
+) -> DayDistribution {
+    let fees_usd = {
+        let clean_io_cpm = Decimal::from(8) / Decimal::from(1000);
+        clean_io_cpm * Decimal::from(impressions) / Decimal::from(1000)
+    };
+    let variance_frac = variances
+        .fracs
+        .iter()
+        .find(|v| v.starts_at >= date)
+        .map(|v| v.frac)
+        .unwrap_or(variances.default_frac);
+    let variance_usd = raw_revenue_usd * variance_frac;
+
+    let net_estimated_revenue_usd =
+        raw_revenue_usd - fees_usd - variance_usd + sum_adjustments_usd;
+
+    DayDistribution {
+        raw_revenue_usd,
+        fees_usd,
+        variance_usd,
+        sum_adjustments_usd,
+        net_revenue_usd: net_estimated_revenue_usd,
+        platform_net_revenue_usd: net_estimated_revenue_usd
+            * PLATFORM_REVENUE_SPLIT,
+        creator_net_revenue_usd: net_estimated_revenue_usd
+            * (dec!(1) - PLATFORM_REVENUE_SPLIT),
+    }
+}