diff --git a/src/amounts.ts b/src/amounts.ts
index ea8f828..e63443c 100644
--- a/src/amounts.ts
+++ b/src/amounts.ts
@@ -51,6 +51,7 @@ export class Balance {
 
 export function asCost(quantity: number, commodity: string): number {
 	// Convert the amount to cost price in the reporting commodity
+	// NB: This function is rarely used - most conversions are performed in SQL via the transactions_with_quantity_ascost view
 	
 	if (commodity === db.metadata.reporting_commodity) {
 		return quantity;
diff --git a/src/db.ts b/src/db.ts
index 7e6a08e..054c9d0 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -135,6 +135,7 @@ export function joinedToTransactions(joinedTransactionPostings: JoinedTransactio
 			account: joinedTransactionPosting.account,
 			quantity: joinedTransactionPosting.quantity,
 			commodity: joinedTransactionPosting.commodity,
+			quantity_ascost: joinedTransactionPosting.quantity_ascost,
 			running_balance: joinedTransactionPosting.running_balance
 		});
 	}
@@ -233,6 +234,7 @@ export interface Posting {
 	account: string,
 	quantity: number,
 	commodity: string,
+	quantity_ascost?: number,
 	running_balance?: number
 }
 
@@ -245,6 +247,7 @@ export interface JoinedTransactionPosting {
 	account: string,
 	quantity: number,
 	commodity: string,
+	quantity_ascost?: number,
 	running_balance?: number
 }
 
diff --git a/src/pages/BalanceAssertionsView.vue b/src/pages/BalanceAssertionsView.vue
index 737fe95..793f5aa 100644
--- a/src/pages/BalanceAssertionsView.vue
+++ b/src/pages/BalanceAssertionsView.vue
@@ -66,7 +66,6 @@
 	
 	import { ref } from 'vue';
 	
-	import { asCost } from '../amounts.ts';
 	import { db } from '../db.ts';
 	import { pp } from '../display.ts';
 	import { ReportingStage, ReportingWorkflow } from '../reporting.ts';
@@ -108,7 +107,7 @@
 				if (dayjs(transaction.dt) <= balanceAssertionDt) {
 					for (const posting of transaction.postings) {
 						if (posting.account === balanceAssertion.account) {
-							accountBalance += asCost(posting.quantity, posting.commodity);
+							accountBalance += posting.quantity_ascost!;
 						}
 					}
 				}
diff --git a/src/pages/EditTransactionView.vue b/src/pages/EditTransactionView.vue
index 7c17281..ccc9776 100644
--- a/src/pages/EditTransactionView.vue
+++ b/src/pages/EditTransactionView.vue
@@ -46,11 +46,10 @@
 		const session = await db.load();
 		
 		const joinedTransactionPostings: JoinedTransactionPosting[] = await session.select(
-			`SELECT transaction_id, dt, transactions.description AS transaction_description, postings.id, postings.description, account, quantity, commodity
-			FROM transactions
-			JOIN postings ON transactions.id = postings.transaction_id
-			WHERE transactions.id = $1
-			ORDER BY postings.id`,
+			`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity
+			FROM joined_transactions
+			WHERE transaction_id = $1
+			ORDER BY id`,
 			[route.params.id]
 		);
 		
diff --git a/src/pages/GeneralLedgerView.vue b/src/pages/GeneralLedgerView.vue
index 6b0d0e5..3c6cc1d 100644
--- a/src/pages/GeneralLedgerView.vue
+++ b/src/pages/GeneralLedgerView.vue
@@ -1,6 +1,6 @@
 <!--
 	DrCr: Web-based double-entry bookkeeping framework
-	Copyright (C) 2022–2024  Lee Yingtong Li (RunasSudo)
+	Copyright (C) 2022–2025  Lee Yingtong Li (RunasSudo)
 	
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Affero General Public License as published by
@@ -67,7 +67,6 @@
 	
 	import { onUnmounted, ref, watch } from 'vue';
 	
-	import { asCost } from '../amounts.ts';
 	import { Transaction, db } from '../db.ts';
 	import { pp, ppWithCommodity } from '../display.ts';
 	import { ReportingStage, ReportingWorkflow } from '../reporting.ts';
@@ -132,10 +131,10 @@
 							<td class="py-0.5 px-1 text-gray-900 text-end"><i>${ posting.quantity >= 0 ? 'Dr' : 'Cr' }</i></td>
 							<td class="py-0.5 px-1 text-gray-900 lg:w-[30%]"><a href="/transactions/${ encodeURIComponent(posting.account) }" class="text-gray-900 hover:text-blue-700 hover:underline">${ posting.account }</a></td>
 							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">
-								${ posting.quantity >= 0 ? pp(asCost(posting.quantity, posting.commodity)) : '' }
+								${ posting.quantity >= 0 ? pp(posting.quantity_ascost!) : '' }
 							</td>
 							<td class="py-0.5 pl-1 text-gray-900 lg:w-[12ex] text-end">
-								${ posting.quantity < 0 ? pp(asCost(-posting.quantity, posting.commodity)) : '' }
+								${ posting.quantity < 0 ? pp(-posting.quantity_ascost!) : '' }
 							</td>
 						</tr>`
 					);
diff --git a/src/pages/JournalView.vue b/src/pages/JournalView.vue
index 0550ebf..39fec4e 100644
--- a/src/pages/JournalView.vue
+++ b/src/pages/JournalView.vue
@@ -1,6 +1,6 @@
 <!--
 	DrCr: Web-based double-entry bookkeeping framework
-	Copyright (C) 2022–2024  Lee Yingtong Li (RunasSudo)
+	Copyright (C) 2022–2025  Lee Yingtong Li (RunasSudo)
 	
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Affero General Public License as published by
@@ -68,7 +68,6 @@
 	
 	import { onUnmounted, ref, watch } from 'vue';
 	
-	import { asCost } from '../amounts.ts';
 	import { JoinedTransactionPosting, Transaction, db, joinedToTransactions } from '../db.ts';
 	import { pp, ppWithCommodity } from '../display.ts';
 	import { renderComponent } from '../webutil.ts';
@@ -82,10 +81,9 @@
 		const session = await db.load();
 		
 		const joinedTransactionPostings: JoinedTransactionPosting[] = await session.select(
-			`SELECT transaction_id, dt, transactions.description AS transaction_description, postings.id, postings.description, account, quantity, commodity
-			FROM transactions
-			JOIN postings ON transactions.id = postings.transaction_id
-			ORDER BY dt DESC, transaction_id DESC, postings.id`
+			`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity, quantity_ascost
+			FROM transactions_with_quantity_ascost
+			ORDER BY dt DESC, transaction_id DESC, id`
 		);
 		
 		transactions.value = joinedToTransactions(joinedTransactionPostings);
@@ -131,10 +129,10 @@
 							<td class="py-0.5 px-1 text-gray-900 text-end"><i>${ posting.quantity >= 0 ? 'Dr' : 'Cr' }</i></td>
 							<td class="py-0.5 px-1 text-gray-900 lg:w-[30%]"><a href="/transactions/${ encodeURIComponent(posting.account) }" class="text-gray-900 hover:text-blue-700 hover:underline">${ posting.account }</a></td>
 							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">
-								${ posting.quantity >= 0 ? pp(asCost(posting.quantity, posting.commodity)) : '' }
+								${ posting.quantity >= 0 ? pp(posting.quantity_ascost!) : '' }
 							</td>
 							<td class="py-0.5 pl-1 text-gray-900 lg:w-[12ex] text-end">
-								${ posting.quantity < 0 ? pp(asCost(-posting.quantity, posting.commodity)) : '' }
+								${ posting.quantity < 0 ? pp(-posting.quantity_ascost!) : '' }
 							</td>
 						</tr>`
 					);
diff --git a/src/pages/TransactionsWithoutCommodityView.vue b/src/pages/TransactionsWithoutCommodityView.vue
index 288fc26..3ef6d90 100644
--- a/src/pages/TransactionsWithoutCommodityView.vue
+++ b/src/pages/TransactionsWithoutCommodityView.vue
@@ -49,7 +49,6 @@
 	import { onMounted, onUnmounted, watch } from 'vue';
 	import { useRoute } from 'vue-router';
 	
-	import { asCost } from '../amounts.ts';
 	import { Transaction } from '../db.ts';
 	import { pp } from '../display.ts';
 	import { renderComponent } from '../webutil.ts';
@@ -67,7 +66,7 @@
 			const transaction = transactions[i];
 			for (const posting of transaction.postings) {
 				if (posting.account === route.params.account) {
-					balance += asCost(posting.quantity, posting.commodity);
+					balance += posting.quantity_ascost!;
 					posting.running_balance = balance;
 				}
 			}
@@ -100,8 +99,8 @@
 						<td class="py-0.5 pr-1 text-gray-900 lg:w-[12ex]">${ dayjs(transaction.dt).format('YYYY-MM-DD') }</td>
 						<td class="py-0.5 px-1 text-gray-900">${ transaction.description } ${ editLink }</td>
 						<td class="py-0.5 px-1 text-gray-900"><a href="/transactions/${ encodeURIComponent(otherAccountPosting!.account) }" class="text-gray-900 hover:text-blue-700 hover:underline">${ otherAccountPosting!.account }</a></td>
-						<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ thisAccountPosting!.quantity >= 0 ? pp(asCost(thisAccountPosting!.quantity, thisAccountPosting!.commodity)) : '' }</td>
-						<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ thisAccountPosting!.quantity < 0 ? pp(asCost(-thisAccountPosting!.quantity, thisAccountPosting!.commodity)) : '' }</td>
+						<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ thisAccountPosting!.quantity >= 0 ? pp(thisAccountPosting!.quantity_ascost!) : '' }</td>
+						<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ thisAccountPosting!.quantity < 0 ? pp(-thisAccountPosting!.quantity_ascost!) : '' }</td>
 						<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ pp(Math.abs(thisAccountPosting!.running_balance!)) }</td>
 						<td class="py-0.5 text-gray-900">${ thisAccountPosting!.running_balance! >= 0 ? 'Dr' : 'Cr' }</td>
 					</tr>`
@@ -125,8 +124,8 @@
 							<td></td>
 							<td class="py-0.5 px-1 text-gray-900 text-end"><i>${ posting.quantity >= 0 ? 'Dr' : 'Cr' }</i></td>
 							<td class="py-0.5 px-1 text-gray-900"><a href="/transactions/${ encodeURIComponent(posting.account) }" class="text-gray-900 hover:text-blue-700 hover:underline">${ posting.account }</a></td>
-							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ posting.quantity >= 0 ? pp(asCost(posting.quantity, posting.commodity)) : '' }</td>
-							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ posting.quantity < 0 ? pp(asCost(-posting.quantity, posting.commodity)) : '' }</td>
+							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ posting.quantity >= 0 ? pp(posting.quantity_ascost!) : '' }</td>
+							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ posting.quantity < 0 ? pp(-posting.quantity_ascost!) : '' }</td>
 							<td class="py-0.5 px-1 text-gray-900 lg:w-[12ex] text-end">${ posting.account === route.params.account ? pp(Math.abs(posting.running_balance!)) : '' }</td>
 							<td class="py-0.5 text-gray-900">${ posting.account === route.params.account ? (posting.running_balance! >= 0 ? 'Dr' : 'Cr') : '' }</td>
 						</tr>`
diff --git a/src/reporting.ts b/src/reporting.ts
index 8e24aa4..fe2a64f 100644
--- a/src/reporting.ts
+++ b/src/reporting.ts
@@ -75,7 +75,7 @@ export class ReportingWorkflow {
 			let joinedTransactionPostings: JoinedTransactionPosting[];
 			if (dt) {
 				joinedTransactionPostings = await session.select(
-					`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity, running_balance
+					`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity, quantity_ascost, running_balance
 					FROM transactions_with_running_balances
 					WHERE DATE(dt) <= DATE($1)
 					ORDER BY dt, transaction_id, id`,
@@ -83,7 +83,7 @@ export class ReportingWorkflow {
 				);
 			} else {
 				joinedTransactionPostings = await session.select(
-					`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity, running_balance
+					`SELECT transaction_id, dt, transaction_description, id, description, account, quantity, commodity, quantity_ascost, running_balance
 					FROM transactions_with_running_balances
 					ORDER BY dt, transaction_id, id`
 				);
@@ -127,14 +127,16 @@ export class ReportingWorkflow {
 							description: null,
 							account: line.source_account,
 							quantity: line.quantity,
-							commodity: line.commodity
+							commodity: line.commodity,
+							quantity_ascost: asCost(line.quantity, line.commodity),
 						},
 						{
 							id: null,
 							description: null,
 							account: unclassifiedAccount,
 							quantity: -line.quantity,
-							commodity: line.commodity
+							commodity: line.commodity,
+							quantity_ascost: asCost(-line.quantity, line.commodity),
 						}
 					]
 				));
@@ -163,7 +165,7 @@ export class ReportingWorkflow {
 			for (const transaction of this.transactionsForStage.get(ReportingStage.OrdinaryAPITransactions)!) {
 				if (!dayjs(transaction.dt).isAfter(dayBeforePeriodStart)) {
 					for (const posting of transaction.postings) {
-						balancesAtPeriodStart.set(posting.account, (balancesAtPeriodStart.get(posting.account) ?? 0) + asCost(posting.quantity, posting.commodity));
+						balancesAtPeriodStart.set(posting.account, (balancesAtPeriodStart.get(posting.account) ?? 0) + posting.quantity_ascost!);
 					}
 				}
 			}
@@ -193,14 +195,16 @@ export class ReportingWorkflow {
 								description: null,
 								account: account,
 								quantity: -balanceAtPeriodStart,
-								commodity: db.metadata.reporting_commodity
+								commodity: db.metadata.reporting_commodity,
+								quantity_ascost: asCost(-balanceAtPeriodStart, db.metadata.reporting_commodity),
 							},
 							{
 								id: null,
 								description: null,
 								account: 'Accumulated surplus (deficit)',
 								quantity: balanceAtPeriodStart,
-								commodity: db.metadata.reporting_commodity
+								commodity: db.metadata.reporting_commodity,
+								quantity_ascost: asCost(balanceAtPeriodStart, db.metadata.reporting_commodity),
 							},
 						]
 					));
@@ -280,9 +284,7 @@ function applyTransactionsToBalances(balances: Map<string, number>, transactions
 	for (const transaction of transactions) {
 		for (const posting of transaction.postings) {
 			const openingBalance = newBalances.get(posting.account) ?? 0;
-			const quantityCost = asCost(posting.quantity, posting.commodity);
-			const runningBalance = openingBalance + quantityCost;
-			
+			const runningBalance = openingBalance + posting.quantity_ascost!;
 			newBalances.set(posting.account, runningBalance);
 		}
 	}