diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1277f0bd6..3bb6ad7ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # Changelog Fab-manager
 
+- [TODO DEPLOY] `rails fablab:maintenance:build_accounting_lines`
+
 - Add reservation deadline parameter (#414)
 - Fix a bug: unable to run test in negavtive timezones (#425)
 
diff --git a/app/frontend/src/javascript/components/accounting/accounting-codes-settings.tsx b/app/frontend/src/javascript/components/accounting/accounting-codes-settings.tsx
index cc77f891c..fe345394c 100644
--- a/app/frontend/src/javascript/components/accounting/accounting-codes-settings.tsx
+++ b/app/frontend/src/javascript/components/accounting/accounting-codes-settings.tsx
@@ -115,7 +115,9 @@ export const AccountingCodesSettings: React.FC<AccountingCodesSettingsProps> = (
       <h4>{t('app.admin.accounting_codes_settings.error')}</h4>
       <div className="error">
         <FormInput register={register} id="accounting_Error_code" label={t('app.admin.accounting_codes_settings.code')} />
-        <FormInput register={register} id="accounting_Error_label" label={t('app.admin.accounting_codes_settings.label')} />
+        <FormInput register={register} id="accounting_Error_label"
+                   label={t('app.admin.accounting_codes_settings.label')}
+                   tooltip={t('app.admin.accounting_codes_settings.error_help')} />
       </div>
       <h4>{t('app.admin.accounting_codes_settings.advanced_accounting')}</h4>
       <FormSwitch control={control} id="advanced_accounting"
diff --git a/app/frontend/src/javascript/components/user/password-input.tsx b/app/frontend/src/javascript/components/user/password-input.tsx
index 4070dfa7f..4d87ad96c 100644
--- a/app/frontend/src/javascript/components/user/password-input.tsx
+++ b/app/frontend/src/javascript/components/user/password-input.tsx
@@ -30,6 +30,7 @@ export const PasswordInput = <TFieldValues extends FieldValues>({ register, curr
                  }}
                  formState={formState}
                  label={t('app.shared.password_input.new_password')}
+                 tooltip={t('app.shared.password_input.help')}
                  type="password" />
       <FormInput id="password_confirmation"
                  register={register}
diff --git a/app/services/accounting/accounting_service.rb b/app/services/accounting/accounting_service.rb
index ffd45cfbb..fe2077530 100644
--- a/app/services/accounting/accounting_service.rb
+++ b/app/services/accounting/accounting_service.rb
@@ -31,6 +31,8 @@ class Accounting::AccountingService
     vat = vat_line(invoice)
     lines << vat unless vat.nil?
 
+    fix_rounding_errors(lines)
+
     lines
   end
 
@@ -137,4 +139,17 @@ class Accounting::AccountingService
 
     "#{reference}, #{items.join(' + ')}"
   end
+
+  # In case of rounding errors, fix the balance by adding or removing a cent to the last item line
+  # This case should only happen when a coupon has been used.
+  def fix_rounding_errors(lines)
+    debit_sum = lines.filter { |l| l[:line_type] == 'client' }.pluck(:debit).sum
+    credit_sum = lines.filter { |l| l[:line_type] != 'client' }.pluck(:credit).sum
+
+    return if debit_sum == credit_sum
+
+    diff = debit_sum - credit_sum
+    fixable_line = lines.filter { |l| l[:line_type] == 'item' }.last
+    fixable_line.credit += diff
+  end
 end
diff --git a/config/locales/app.admin.en.yml b/config/locales/app.admin.en.yml
index 186ea9b24..f007db661 100644
--- a/config/locales/app.admin.en.yml
+++ b/config/locales/app.admin.en.yml
@@ -159,6 +159,7 @@ en:
         prepaid_pack: "Pack of prepaid-hours"
         product: "Product of the store"
         error: "Erroneous invoices"
+        error_help: "As part of a maintenance operation, it may exceptionally happen that invoices, that have been generated by mistake due to a bug in the software, are discovered. As these invoices cannot be deleted, they will be exported to the account defined here. Please manually cancel these invoices."
         advanced_accounting: "Advanced accounting"
         enable_advanced: "Enable the advanced accounting"
         enable_advanced_help: "This will enable the ability to have custom accounting codes per resources (machines, spaces, training ...). These codes can be modified on each resource edition form."
diff --git a/config/locales/app.shared.en.yml b/config/locales/app.shared.en.yml
index 946ddf7f0..d2895e99c 100644
--- a/config/locales/app.shared.en.yml
+++ b/config/locales/app.shared.en.yml
@@ -110,6 +110,7 @@ en:
       password_input:
         new_password: "New password"
         confirm_password: "Confirm password"
+        help: "Your password must be minimum 12 characters long, have at least one uppercase letter, one lowercase letter, one number and one special character."
         password_too_short: "Password is too short (must be at least 12 characters)"
         confirmation_mismatch: "Confirmation mismatch with password."
       #project edition form
diff --git a/db/migrate/20210521085710_add_object_to_invoice_item.rb b/db/migrate/20210521085710_add_object_to_invoice_item.rb
index b6b71ad7d..eb96bd41f 100644
--- a/db/migrate/20210521085710_add_object_to_invoice_item.rb
+++ b/db/migrate/20210521085710_add_object_to_invoice_item.rb
@@ -8,9 +8,9 @@ require 'integrity/archive_helper'
 # Invoice.invoiced and the subscription was saved in InvoiceItem.subscription_id
 #
 # From this migration, everything will be saved in InvoiceItems.object_id & InvoiceItem.object_type. This will be more
-# extensible and will allow to invoice more types of objects  the future.
+# extensible and will allow to invoice more types of objects in the future.
 class AddObjectToInvoiceItem < ActiveRecord::Migration[5.2]
-  def up
+  def up # rubocop:disable Metrics/MethodLength, Metrics/AbcSize
     # first check that there's no bogus invoices
     raise InvalidInvoiceError if Invoice.where(invoiced_id: nil).where.not(invoiced_type: 'Error').count.positive?
 
@@ -40,7 +40,7 @@ class AddObjectToInvoiceItem < ActiveRecord::Migration[5.2]
             main = true
         WHERE id = #{invoice.invoice_items.where(subscription_id: nil).first.id}
       )
-      invoice.invoice_items.where(subscription_id: nil)[1..-1].each do |ii|
+      invoice.invoice_items.where(subscription_id: nil)[1..].each do |ii|
         execute %(
           UPDATE invoice_items
           SET object_id = #{invoice.invoiced_id || 'NULL'},
diff --git a/db/seeds.rb b/db/seeds.rb
index 1b26cbdca..55821e783 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -995,6 +995,8 @@ Setting.set('store_hidden', true) unless Setting.find_by(name: 'store_hidden').t
 
 Setting.set('advanced_accounting', false) unless Setting.find_by(name: 'advanced_accounting').try(:value)
 
+Setting.set('accounting_VAT_code', '4457') unless Setting.find_by(name: 'accounting_VAT_code').try(:value)
+
 if StatisticCustomAggregation.count.zero?
   # available reservations hours for machines
   machine_hours = StatisticType.find_by(key: 'hour', statistic_index_id: 2)
diff --git a/lib/tasks/fablab/fix.rake b/lib/tasks/fablab/fix.rake
index 10ea20edc..73959c870 100644
--- a/lib/tasks/fablab/fix.rake
+++ b/lib/tasks/fablab/fix.rake
@@ -5,11 +5,11 @@ namespace :fablab do
   namespace :fix do
     desc '[release 2.3.0] update reservations referencing reservables not present in database'
     task reservations_not_existing_reservable: :environment do
-      ActiveRecord::Base.logger = Logger.new(STDOUT)
+      ActiveRecord::Base.logger = Logger.new($stdout)
       ActiveRecord::Base.connection.execute(
-        'UPDATE reservations SET reservable_type = NULL, reservable_id = NULL'\
-        ' WHERE NOT EXISTS (SELECT 1 FROM events WHERE events.id = reservations.reservable_id)'\
-        ' AND reservations.reservable_type = \'Event\''
+        'UPDATE reservations SET reservable_type = NULL, reservable_id = NULL ' \
+        'WHERE NOT EXISTS (SELECT 1 FROM events WHERE events.id = reservations.reservable_id) ' \
+        "AND reservations.reservable_type = 'Event'"
       )
     end
 
@@ -98,7 +98,7 @@ namespace :fablab do
     task categories_slugs: :environment do
       Category.all.each do |cat|
         # rubocop:disable Layout/LineLength
-        `curl -XPOST http://#{ENV['ELASTICSEARCH_HOST']}:9200/stats/event/_update_by_query?conflicts=proceed\\&refresh\\&wait_for_completion -d '
+        `curl -XPOST http://#{ENV.fetch('ELASTICSEARCH_HOST', nil)}:9200/stats/event/_update_by_query?conflicts=proceed\\&refresh\\&wait_for_completion -d '
         {
           "script": {
             "source": "ctx._source.subType = params.slug",
@@ -279,39 +279,5 @@ namespace :fablab do
         puts i
       end
     end
-
-    desc '[release 5.6.0] fix rounding issue on invoices using coupon'
-    task invoices_rounding: :environment do
-      coupon_service = CouponService.new
-      vat_service = VatHistoryService.new
-
-      # check invoices and udpate erroneous
-      Invoice.find_each do |invoice|
-        main_item = invoice.main_item.amount
-        other_items = invoice.other_items.map(&:amount).sum
-
-        total_without_coupon = coupon_service.invoice_total_no_coupon(invoice)
-        main_item_net = coupon_service.ventilate(total_without_coupon, main_item, invoice.coupon)
-        other_items_net = coupon_service.ventilate(total_without_coupon, other_items, invoice.coupon)
-
-        vat_rate_groups = vat_service.invoice_vat(invoice)
-        total_vat = vat_rate_groups.values.pluck(:total_vat).sum
-        total_excl_taxes = invoice.invoice_items.map(&:net_amount).sum
-        new_total = total_vat + total_excl_taxes
-        if (invoice.total != main_item_net + other_items_net) || (new_total != invoice.total)
-          Rails.logger.info "Fixing invoice #{invoice.id}... Previous total = #{invoice.total}, fixed total = #{new_total}"
-          invoice.update(total: new_total)
-        end
-      end
-      # chain invoices
-      if AccountingPeriod.count.positive?
-        last_period = AccountingPeriod.order(start_at: :desc).first
-        puts "Regenerating from #{last_period.end_at}..."
-        Invoice.where('created_at > ?', last_period.end_at).order(:id).each(&:chain_record)
-      else
-        puts '(Re)generating all footprint...'
-        Invoice.order(:id).all.each(&:chain_record)
-      end
-    end
   end
 end
diff --git a/lib/tasks/fablab/maintenance.rake b/lib/tasks/fablab/maintenance.rake
index 6c08b2193..e6475db73 100644
--- a/lib/tasks/fablab/maintenance.rake
+++ b/lib/tasks/fablab/maintenance.rake
@@ -5,10 +5,7 @@ namespace :fablab do
   namespace :maintenance do
     desc 'Regenerate the invoices (invoices & avoirs) PDF'
     task :regenerate_invoices, %i[year month] => :environment do |_task, args|
-      year = args.year || Time.current.year
-      month = args.month || Time.current.month
-      start_date = Time.zone.local(year.to_i, month.to_i, 1)
-      end_date = start_date.next_month
+      start_date, end_date = dates_from_args(args)
       puts "-> Start regenerate the invoices PDF between #{I18n.l start_date, format: :long} and " \
            "#{I18n.l end_date - 1.minute, format: :long}"
       invoices = Invoice.where('created_at >= :start_date AND created_at < :end_date', start_date: start_date, end_date: end_date)
@@ -18,10 +15,7 @@ namespace :fablab do
     end
 
     task :regenerate_schedules, %i[year month] => :environment do |_task, args|
-      year = args.year || Time.current.year
-      month = args.month || Time.current.month
-      start_date = Time.zone.local(year.to_i, month.to_i, 1)
-      end_date = start_date.next_month
+      start_date, end_date = dates_from_args(args)
       puts "-> Start regenerate the payment schedules PDF between #{I18n.l start_date, format: :long} and " \
            "#{I18n.l end_date - 1.minute, format: :long}"
       schedules = PaymentSchedule.where('created_at >= :start_date AND created_at < :end_date', start_date: start_date, end_date: end_date)
@@ -126,10 +120,7 @@ namespace :fablab do
 
     desc 'Regenerate the invoices (invoices & avoirs) reference'
     task :regenerate_invoices_reference, %i[year month] => :environment do |_task, args|
-      year = args.year || Time.current.year
-      month = args.month || Time.current.month
-      start_date = Time.zone.local(year.to_i, month.to_i, 1)
-      end_date = start_date.next_month
+      start_date, end_date = dates_from_args(args)
       puts "-> Start regenerate the invoices reference between #{I18n.l start_date, format: :long} and " \
            "#{I18n.l end_date - 1.minute, format: :long}"
       invoices = Invoice.where('created_at >= :start_date AND created_at < :end_date', start_date: start_date, end_date: end_date)
@@ -137,5 +128,22 @@ namespace :fablab do
       invoices.each(&:update_reference)
       puts '-> Done'
     end
+
+    desc 'Regenerate accounting lines'
+    task :regenerate_accounting_lines, %i[year month] => :environment do |_task, args|
+      start_date, end_date = dates_from_args(args)
+      puts "-> Start regenerate the accounting lines between #{I18n.l start_date, format: :long} and " \
+           "#{I18n.l end_date - 1.minute, format: :long}"
+      AccountingLine.where(date: start_date..end_date).destroy_all
+      Accounting::AccountingService.new.build(start_date.beginning_of_day, end_date.end_of_day)
+      puts '-> Done'
+    end
+
+    def dates_from_args(args)
+      year = args.year || Time.current.year
+      month = args.month || Time.current.month
+      start_date = Time.zone.local(year.to_i, month.to_i, 1)
+      [start_date, start_date.next_month]
+    end
   end
 end
diff --git a/lib/tasks/fablab/setup.rake b/lib/tasks/fablab/setup.rake
index ef5ae460c..360f9f76d 100644
--- a/lib/tasks/fablab/setup.rake
+++ b/lib/tasks/fablab/setup.rake
@@ -127,6 +127,15 @@ namespace :fablab do
       print "\e[32m✅\e[0m \e[1mDone\e[0m\n"
     end
 
+    desc 'generate acconting lines'
+    task build_accounting_lines: :environment do
+      start_date = Invoice.order(created_at: :asc).first&.created_at
+      end_date = DateTime.current
+      AccountingLine.where(date: start_date..end_date).destroy_all
+      Accounting::AccountingService.new.build(start_date&.beginning_of_day, end_date.end_of_day)
+      puts '-> Done'
+    end
+
     def select_group(groups)
       groups.each do |g|
         print "#{g.id}) #{g.name}\n"