diff --git a/backend/src/config/index.ts b/backend/src/config/index.ts
index f357f5027..75c985e63 100644
--- a/backend/src/config/index.ts
+++ b/backend/src/config/index.ts
@@ -1,16 +1,8 @@
 // ATTENTION: DO NOT PUT ANY SECRETS IN HERE (or the .env)
 
 import dotenv from 'dotenv'
-import Decimal from 'decimal.js-light'
 dotenv.config()
 
-// Set precision value
-// TODO test if this works here
-Decimal.set({
-  precision: 25,
-  rounding: Decimal.ROUND_HALF_UP,
-})
-
 const constants = {
   DB_VERSION: '0028-clean_transaction_table',
   DECAY_START_TIME: new Date('2021-05-13 17:46:31'), // GMT+0
diff --git a/backend/src/graphql/arg/TransactionSendArgs.ts b/backend/src/graphql/arg/TransactionSendArgs.ts
index e75921383..49a3fb5e8 100644
--- a/backend/src/graphql/arg/TransactionSendArgs.ts
+++ b/backend/src/graphql/arg/TransactionSendArgs.ts
@@ -1,5 +1,5 @@
 import { ArgsType, Field } from 'type-graphql'
-import Decimal from 'decimal.js-light'
+import Decimal from '../../util/decimal'
 
 @ArgsType()
 export default class TransactionSendArgs {
diff --git a/backend/src/graphql/model/Balance.ts b/backend/src/graphql/model/Balance.ts
index 7a3891ece..7d2be38c4 100644
--- a/backend/src/graphql/model/Balance.ts
+++ b/backend/src/graphql/model/Balance.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-import Decimal from 'decimal.js-light'
 import { ObjectType, Field } from 'type-graphql'
+import Decimal from '../../util/decimal'
 
 @ObjectType()
 export class Balance {
diff --git a/backend/src/graphql/model/Decay.ts b/backend/src/graphql/model/Decay.ts
index a76e66939..ab70ab6f8 100644
--- a/backend/src/graphql/model/Decay.ts
+++ b/backend/src/graphql/model/Decay.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-import Decimal from 'decimal.js-light'
 import { ObjectType, Field } from 'type-graphql'
+import Decimal from '../../util/decimal'
 
 @ObjectType()
 export class Decay {
diff --git a/backend/src/graphql/model/Transaction.ts b/backend/src/graphql/model/Transaction.ts
index 4c8dbbe38..4d19479c7 100644
--- a/backend/src/graphql/model/Transaction.ts
+++ b/backend/src/graphql/model/Transaction.ts
@@ -1,9 +1,9 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-import Decimal from 'decimal.js-light'
 import { ObjectType, Field } from 'type-graphql'
 import { Decay } from './Decay'
 import { Transaction as dbTransaction } from '@entity/Transaction'
+import Decimal from '../../util/decimal'
 import { TransactionTypeId } from '../enum/TransactionTypeId'
 import { User } from './User'
 
diff --git a/backend/src/graphql/model/TransactionList.ts b/backend/src/graphql/model/TransactionList.ts
index 470eca7ef..91beb01ac 100644
--- a/backend/src/graphql/model/TransactionList.ts
+++ b/backend/src/graphql/model/TransactionList.ts
@@ -1,8 +1,8 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 /* eslint-disable @typescript-eslint/explicit-module-boundary-types */
-import Decimal from 'decimal.js-light'
 import { ObjectType, Field } from 'type-graphql'
 import CONFIG from '../../config'
+import Decimal from '../../util/decimal'
 import { Transaction } from './Transaction'
 
 @ObjectType()
diff --git a/backend/src/graphql/resolver/AdminResolver.ts b/backend/src/graphql/resolver/AdminResolver.ts
index 1ee7f326c..b1b68e521 100644
--- a/backend/src/graphql/resolver/AdminResolver.ts
+++ b/backend/src/graphql/resolver/AdminResolver.ts
@@ -27,7 +27,7 @@ import { hasElopageBuys } from '../../util/hasElopageBuys'
 import { LoginEmailOptIn } from '@entity/LoginEmailOptIn'
 import { User } from '@entity/User'
 import { TransactionTypeId } from '../enum/TransactionTypeId'
-import Decimal from 'decimal.js-light'
+import Decimal from '../../util/decimal'
 
 // const EMAIL_OPT_IN_REGISTER = 1
 // const EMAIL_OPT_UNKNOWN = 3 // elopage?
diff --git a/backend/src/graphql/resolver/BalanceResolver.ts b/backend/src/graphql/resolver/BalanceResolver.ts
index e536093bb..1680ba8d7 100644
--- a/backend/src/graphql/resolver/BalanceResolver.ts
+++ b/backend/src/graphql/resolver/BalanceResolver.ts
@@ -8,7 +8,7 @@ import { UserRepository } from '../../typeorm/repository/User'
 import { calculateDecay } from '../../util/decay'
 import { RIGHTS } from '../../auth/RIGHTS'
 import { Transaction } from '@entity/Transaction'
-import Decimal from 'decimal.js-light'
+import Decimal from '../../util/decimal'
 
 @Resolver()
 export class BalanceResolver {
diff --git a/backend/src/graphql/schema.ts b/backend/src/graphql/schema.ts
index 97bd3b632..54ee89c42 100644
--- a/backend/src/graphql/schema.ts
+++ b/backend/src/graphql/schema.ts
@@ -1,10 +1,10 @@
 import { GraphQLSchema } from 'graphql'
 import { buildSchema } from 'type-graphql'
-import Decimal from 'decimal.js-light'
 import path from 'path'
 
 import isAuthorized from './directive/isAuthorized'
 import DecimalScalar from './scalar/Decimal'
+import Decimal from '../util/decimal'
 
 const schema = async (): Promise<GraphQLSchema> => {
   return buildSchema({
diff --git a/backend/src/mailer/sendTransactionReceivedEmail.test.ts b/backend/src/mailer/sendTransactionReceivedEmail.test.ts
index 5fd013650..ce1d50920 100644
--- a/backend/src/mailer/sendTransactionReceivedEmail.test.ts
+++ b/backend/src/mailer/sendTransactionReceivedEmail.test.ts
@@ -1,6 +1,6 @@
 import { sendTransactionReceivedEmail } from './sendTransactionReceivedEmail'
 import { sendEMail } from './sendEMail'
-import Decimal from 'decimal.js-light'
+import Decimal from '../util/decimal'
 
 jest.mock('./sendEMail', () => {
   return {
diff --git a/backend/src/mailer/sendTransactionReceivedEmail.ts b/backend/src/mailer/sendTransactionReceivedEmail.ts
index 3b417b10a..d4a97eab7 100644
--- a/backend/src/mailer/sendTransactionReceivedEmail.ts
+++ b/backend/src/mailer/sendTransactionReceivedEmail.ts
@@ -1,4 +1,4 @@
-import Decimal from 'decimal.js-light'
+import Decimal from '../util/decimal'
 import { sendEMail } from './sendEMail'
 import { transactionReceived } from './text/transactionReceived'
 
diff --git a/backend/src/mailer/text/transactionReceived.ts b/backend/src/mailer/text/transactionReceived.ts
index f685c60ae..747e30bdf 100644
--- a/backend/src/mailer/text/transactionReceived.ts
+++ b/backend/src/mailer/text/transactionReceived.ts
@@ -1,4 +1,4 @@
-import Decimal from 'decimal.js-light'
+import Decimal from '../../util/decimal'
 
 export const transactionReceived = {
   de: {
diff --git a/backend/src/util/decay.test.ts b/backend/src/util/decay.test.ts
index 1653376c1..31d8905b2 100644
--- a/backend/src/util/decay.test.ts
+++ b/backend/src/util/decay.test.ts
@@ -1,4 +1,4 @@
-import Decimal from 'decimal.js-light'
+import Decimal from './decimal'
 import 'reflect-metadata' // This might be wise to load in a test setup file
 import { decayFormula, calculateDecay } from './decay'
 
diff --git a/backend/src/util/validate.ts b/backend/src/util/validate.ts
index dc3aadbec..2f9017447 100644
--- a/backend/src/util/validate.ts
+++ b/backend/src/util/validate.ts
@@ -1,5 +1,5 @@
 import { calculateDecay } from './decay'
-import Decimal from 'decimal.js-light'
+import Decimal from './decimal'
 import { Transaction } from '@entity/Transaction'
 
 function isStringBoolean(value: string): boolean {
diff --git a/backend/src/util/virtualDecayTransaction.ts b/backend/src/util/virtualDecayTransaction.ts
index f5f35823f..c6b7391f1 100644
--- a/backend/src/util/virtualDecayTransaction.ts
+++ b/backend/src/util/virtualDecayTransaction.ts
@@ -1,5 +1,5 @@
 /* eslint-disable @typescript-eslint/no-unused-vars */
-import Decimal from 'decimal.js-light'
+import Decimal from './decimal'
 import { SaveOptions, RemoveOptions } from '@dbTools/typeorm'
 import { Transaction as dbTransaction } from '@entity/Transaction'
 import { calculateDecay } from './decay'