diff --git a/deploy/edit_expense.sql b/deploy/edit_expense.sql
new file mode 100644
index 0000000..ed99dcc
--- /dev/null
+++ b/deploy/edit_expense.sql
@@ -0,0 +1,50 @@
+-- Deploy numerus:edit_expense to pg
+-- requires: schema_numerus
+-- requires: expense
+-- requires: currency
+-- requires: parse_price
+-- requires: tax
+-- requires: tag_name
+
+begin;
+
+set search_path to numerus, public;
+
+create or replace function edit_expense(expense_slug uuid, invoice_date date, contact_id integer, invoice_number text, amount text, taxes integer[], tags tag_name[]) returns uuid as
+$$
+declare
+	eid integer;
+begin
+	update expense
+	set invoice_date = edit_expense.invoice_date
+	  , contact_id = edit_expense.contact_id
+	  , invoice_number = edit_expense.invoice_number
+	  , amount = parse_price(edit_expense.amount, decimal_digits)
+	  , tags = edit_expense.tags
+	from currency
+	where slug = expense_slug
+	and currency.currency_code = expense.currency_code
+	returning expense_id
+	into eid;
+
+	if eid is null then
+		return null;
+	end if;
+
+	delete from expense_tax where expense_id = eid;
+
+	insert into expense_tax (expense_id, tax_id, tax_rate)
+	select eid, tax_id, tax.rate
+	from tax
+	join unnest(taxes) as etax(tax_id) using (tax_id);
+
+	return expense_slug;
+end;
+$$
+language plpgsql;
+
+revoke execute on function edit_expense(uuid, date, integer, text, text, integer[], tag_name[]) from public;
+grant execute on function edit_expense(uuid, date, integer, text, text, integer[], tag_name[]) to invoicer;
+grant execute on function edit_expense(uuid, date, integer, text, text, integer[], tag_name[]) to admin;
+
+commit;
diff --git a/revert/edit_expense.sql b/revert/edit_expense.sql
new file mode 100644
index 0000000..3ec4a19
--- /dev/null
+++ b/revert/edit_expense.sql
@@ -0,0 +1,7 @@
+-- Revert numerus:edit_expense from pg
+
+begin;
+
+drop function if exists numerus.edit_expense(uuid, date, integer, text, text, integer[], numerus.tag_name[]);
+
+commit;
diff --git a/sqitch.plan b/sqitch.plan
index 2b941d3..c00652b 100644
--- a/sqitch.plan
+++ b/sqitch.plan
@@ -73,3 +73,4 @@ edit_contact [schema_numerus email extension_uri country_code tag_name contact e
 expense [schema_numerus contact company currency_code currency tag_name] 2023-04-30T13:46:36Z jordi fita mas <jordi@tandem.blog> # Add the expense relation
 expense_tax [schema_numerus expense tax tax_rate] 2023-05-01T14:08:33Z jordi fita mas <jordi@tandem.blog> # Add relation of expense taxes
 add_expense [schema_numerus expense expense_tax tax company currency parse_price tag_name] 2023-05-02T08:00:26Z jordi fita mas <jordi@tandem.blog> # Add function to create new expenses
+edit_expense [schema_numerus expense currency parse_price tax tag_name] 2023-05-04T09:53:04Z jordi fita mas <jordi@tandem.blog> # Add function to edit expenses
diff --git a/test/edit_expense.sql b/test/edit_expense.sql
new file mode 100644
index 0000000..9dd02ed
--- /dev/null
+++ b/test/edit_expense.sql
@@ -0,0 +1,103 @@
+-- Test edit_expense
+set client_min_messages to warning;
+create extension if not exists pgtap;
+reset client_min_messages;
+
+begin;
+
+select plan(13);
+
+set search_path to auth, numerus, public;
+
+select has_function('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]']);
+select function_lang_is('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'plpgsql');
+select function_returns('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'uuid');
+select isnt_definer('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]']);
+select volatility_is('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'volatile');
+select function_privs_are('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'guest', array []::text[]);
+select function_privs_are('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'invoicer', array ['EXECUTE']);
+select function_privs_are('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'admin', array ['EXECUTE']);
+select function_privs_are('numerus', 'edit_expense', array ['uuid', 'date', 'integer', 'text', 'text', 'integer[]', 'tag_name[]'], 'authenticator', array []::text[]);
+
+
+set client_min_messages to warning;
+truncate expense_tax cascade;
+truncate expense cascade;
+truncate contact cascade;
+truncate tax cascade;
+truncate tax_class cascade;
+truncate payment_method cascade;
+truncate company cascade;
+reset client_min_messages;
+
+
+set constraints "company_default_payment_method_id_fkey" deferred;
+
+insert into company (company_id, business_name, vatin, trade_name, phone, email, web, address, city, province, postal_code, country_code, currency_code, default_payment_method_id)
+values (1, 'Company 2', 'XX123', '', '555-555-555', 'a@a', '', '', '', '', '', 'ES', 'EUR', 111)
+;
+
+insert into payment_method (payment_method_id, company_id, name, instructions)
+values (111, 1, 'cash', 'cash')
+     , (112, 1, 'bank', 'send money to my bank account')
+;
+
+set constraints "company_default_payment_method_id_fkey" immediate;
+
+insert into tax_class (tax_class_id, company_id, name)
+values (11, 1, 'tax')
+;
+
+insert into tax (tax_id, company_id, tax_class_id, name, rate)
+values (3, 1, 11, 'IRPF -15 %', -0.15)
+     , (4, 1, 11, 'IVA 21 %', 0.21)
+;
+
+insert into contact (contact_id, company_id, business_name, vatin, trade_name, phone, email, web, address, city, province, postal_code, country_code)
+values (12, 1, 'Contact 2.1', 'XX555', '', '777-777-777', 'c@c', '', '', '', '', '', 'ES')
+     , (13, 1, 'Contact 2.2', 'XX666', '', '888-888-888', 'd@d', '', '', '', '', '', 'ES')
+;
+
+insert into expense (expense_id, company_id, slug, invoice_number, invoice_date, contact_id, amount, currency_code, tags)
+values (15, 1, '7ac3ae0e-b0c1-4206-a19b-0be20835edd4', 'INV1', '2023-05-04', 12, 111, 'EUR', '{tag1}')
+     , (16, 1, 'b57b980b-247b-4be4-a0b7-03a7819c53ae', 'INV2', '2023-05-05', 13, 222, 'EUR', '{tag2}')
+;
+
+insert into expense_tax (expense_id, tax_id, tax_rate)
+values (15, 4, 0.21)
+     , (15, 3, -0.07)
+     , (16, 4, 0.20)
+;
+
+select lives_ok(
+	$$ select edit_expense('7ac3ae0e-b0c1-4206-a19b-0be20835edd4', '2023-05-06', 13, 'INV11', '1.12', '{4}', array['tag1']) $$,
+	'Should be able to edit the first expense'
+);
+
+select lives_ok(
+	$$ select edit_expense('b57b980b-247b-4be4-a0b7-03a7819c53ae', '2023-05-07', 12, 'INV22', '3.33', '{4,3}', array['tag1', 'tag3']) $$,
+	'Should be able to edit the second expense'
+);
+
+select bag_eq(
+	$$ select invoice_number, invoice_date, contact_id, amount, tags from expense $$,
+	$$ values ('INV11', '2023-05-06'::date, 13, 112, '{tag1}'::tag_name[])
+	        , ('INV22', '2023-05-07'::date, 12, 333, '{tag1,tag3}'::tag_name[])
+	$$,
+	'Should have updated all expenses'
+);
+
+select bag_eq(
+	$$ select invoice_number, tax_id, tax_rate from expense_tax join expense using (expense_id) $$,
+	$$ values ('INV11', 4, 0.21)
+		, ('INV22', 3, -0.15)
+		, ('INV22', 4, 0.21)
+	$$,
+	'Should have updated all expense taxes, added new ones, and removed the ones not given to the function'
+);
+
+
+select *
+from finish();
+
+rollback;
diff --git a/verify/edit_expense.sql b/verify/edit_expense.sql
new file mode 100644
index 0000000..60e6663
--- /dev/null
+++ b/verify/edit_expense.sql
@@ -0,0 +1,7 @@
+-- Verify numerus:edit_expense on pg
+
+begin;
+
+select has_function_privilege('numerus.edit_expense(uuid, date, integer, text, text, integer[], numerus.tag_name[])', 'execute');
+
+rollback;