diff --git a/components/header.tsx b/components/header.tsx
index d6161b6..676a1a0 100644
--- a/components/header.tsx
+++ b/components/header.tsx
@@ -1,10 +1,6 @@
 import React from 'react'
 
-export default function Header({
-  label = 'Pfadi Bussle Buchen',
-}: {
-  label?: string
-}) {
+export default function Header({ label = 'Pfadi Bussle' }: { label?: string }) {
   return (
     <div className="flex flex-row items-center p-3 my-3 text-white bg-gray-600 rounded-sm">
       <h1 className="flex-grow text-3xl">{label}</h1>
diff --git a/db/bill.ts b/db/bill.ts
index b4d8f70..468f1dc 100644
--- a/db/bill.ts
+++ b/db/bill.ts
@@ -1,7 +1,8 @@
 import * as mongoose from 'mongoose'
-import { BILL_STATUS, MILAGE_RATES, getMilageRateValue } from './enums'
+import { BILL_STATUS, MILAGE_TARIFS } from './enums'
+import { getBillTotal } from '../helpers/bill'
 
-export interface AdditionalCosts {
+export interface AdditionalCost {
   name: string
   value: number
 }
@@ -12,9 +13,9 @@ export interface BillDocument
   milageStart: number
   milageEnd: number
   milage?: number
-  rate: MILAGE_RATES
+  tarif: MILAGE_TARIFS
   status: BILL_STATUS
-  additionalCosts: AdditionalCosts[]
+  additionalCosts: AdditionalCost[]
 }
 
 export interface BillModel extends mongoose.Model<BillDocument> {}
@@ -46,10 +47,10 @@ const BillSchema = new mongoose.Schema<BillDocument>(
         message: (props) => `${props.value} is smaller than milageStart!`,
       },
     },
-    rate: {
+    tarif: {
       type: String,
-      enum: Object.values(MILAGE_RATES),
-      default: MILAGE_RATES.EXTERN_LTE_200,
+      enum: Object.values(MILAGE_TARIFS),
+      default: MILAGE_TARIFS.EXTERN,
       required: true,
     },
     additionalCosts: [
@@ -79,13 +80,7 @@ BillSchema.virtual('milage').get(function () {
 BillSchema.virtual('total').get(function () {
   const bill = this as BillDocument
 
-  const milageCosts =
-    Math.round(bill.milage * getMilageRateValue(bill.rate) * 100) / 100
-  const additionalCostSum = bill.additionalCosts
-    .map(({ value }) => value)
-    .reduce((acc, value) => acc + value, 0)
-
-  return milageCosts + additionalCostSum
+  return getBillTotal(bill)
 })
 
 export default <BillModel>mongoose.models.Bill ||
diff --git a/db/enums.ts b/db/enums.ts
index 5868e48..da6040c 100644
--- a/db/enums.ts
+++ b/db/enums.ts
@@ -11,30 +11,8 @@ export enum BILL_STATUS {
   PAID = 'paid',
 }
 
-export enum MILAGE_RATES {
-  INTERN_LTE_200 = 'intern_lte_200_km',
-  INTERN_201_1000 = 'intern_201_1000_km',
-  INTERN_1001_2000 = 'intern_1001_2000_km',
-  INTERN_GTE_2001 = 'intern_gte_2001_km',
-  EXTERN_LTE_200 = 'extern_lte_200_km',
-  EXTERN_201_1000 = 'extern_201_1000_km',
-  EXTERN_1001_2000 = 'extern_1001_2000_km',
-  EXTERN_GTE_2001 = 'extern_gte_2001_km',
-  FREE_OF_CHARGE = 'free_of_charge',
-}
-
-const rates = {
-  [MILAGE_RATES.INTERN_LTE_200]: 0.37,
-  [MILAGE_RATES.INTERN_201_1000]: 0.22,
-  [MILAGE_RATES.INTERN_1001_2000]: 0.15,
-  [MILAGE_RATES.INTERN_GTE_2001]: 0.13,
-  [MILAGE_RATES.EXTERN_LTE_200]: 0.42,
-  [MILAGE_RATES.EXTERN_201_1000]: 0.25,
-  [MILAGE_RATES.EXTERN_1001_2000]: 0.2,
-  [MILAGE_RATES.EXTERN_GTE_2001]: 0.18,
-  [MILAGE_RATES.FREE_OF_CHARGE]: 0,
-}
-
-export function getMilageRateValue(milageRate: MILAGE_RATES): number {
-  return rates[milageRate]
+export enum MILAGE_TARIFS {
+  INTERN = 'intern',
+  EXTERN = 'extern',
+  NOCHARGE = 'nocharge',
 }
diff --git a/helpers/bill.ts b/helpers/bill.ts
new file mode 100644
index 0000000..d809072
--- /dev/null
+++ b/helpers/bill.ts
@@ -0,0 +1,65 @@
+import { MILAGE_TARIFS } from '../db/enums'
+import { AdditionalCost } from '../db/bill'
+
+function roundToCent(amount: number) {
+  return Math.round(amount * 100) / 100
+}
+
+export function getMilageCosts(tarif: MILAGE_TARIFS, km: number): number {
+  if (tarif === MILAGE_TARIFS.NOCHARGE) {
+    return 0
+  }
+
+  if (km <= 0) {
+    return 0
+  }
+
+  let rate: number
+
+  if (tarif === MILAGE_TARIFS.EXTERN) {
+    if (km <= 200) {
+      rate = 0.42
+    } else if (km <= 1000) {
+      rate = 0.25
+    } else if (km <= 2000) {
+      rate = 0.2
+    } else {
+      rate = 0.18
+    }
+  }
+
+  if (tarif === MILAGE_TARIFS.INTERN) {
+    if (km <= 200) {
+      rate = 0.37
+    } else if (km <= 1000) {
+      rate = 0.22
+    } else if (km <= 2000) {
+      rate = 0.15
+    } else {
+      rate = 0.13
+    }
+  }
+
+  if (rate === undefined) {
+    throw Error('Unable to determine rate')
+  }
+
+  return roundToCent(km * rate)
+}
+
+export function getBillTotal({
+  tarif,
+  milage,
+  additionalCosts,
+}: {
+  tarif: MILAGE_TARIFS
+  milage?: number
+  additionalCosts: AdditionalCost[]
+}): number {
+  const milageCosts = getMilageCosts(tarif, milage)
+  const additionalCostsSum = additionalCosts
+    .map(({ value }) => value)
+    .reduce((acc: number, value: number) => acc + value, 0)
+
+  return roundToCent(milageCosts + additionalCostsSum)
+}
diff --git a/pages/booking/[uuid]/bill.tsx b/pages/booking/[uuid]/bill.tsx
index 2ac9d0a..1400ef7 100644
--- a/pages/booking/[uuid]/bill.tsx
+++ b/pages/booking/[uuid]/bill.tsx
@@ -4,20 +4,17 @@ import Footer from '../../../components/footer'
 import Header from '../../../components/header'
 import Input from '../../../components/input'
 import Select from '../../../components/select'
-import { AdditionalCosts, BillDocument } from '../../../db/bill'
+import { AdditionalCost, BillDocument } from '../../../db/bill'
 import { BookingDocument } from '../../../db/booking'
-import {
-  BILL_STATUS,
-  MILAGE_RATES,
-  getMilageRateValue,
-} from '../../../db/enums'
+import { BILL_STATUS, MILAGE_TARIFS } from '../../../db/enums'
 import { getBookingByUUID, getMilageMax } from '../../../db/index'
 import { dateFormatFrontend } from '../../../helpers/date'
+import { getBillTotal } from '../../../helpers/bill'
 
-const milageRateOptions = Object.values(MILAGE_RATES).map((rate) => {
+const milageTarifOptions = Object.values(MILAGE_TARIFS).map((tarif) => {
   return (
-    <option value={rate} key={rate}>
-      {getRateLabel(rate)} ({getMilageRateValue(rate)} EUR)
+    <option value={tarif} key={tarif}>
+      {getTarifLabel(tarif)}
     </option>
   )
 })
@@ -54,26 +51,14 @@ export const getServerSideProps: GetServerSideProps = async (context) => {
   }
 }
 
-function getRateLabel(rate: MILAGE_RATES) {
-  switch (rate) {
-    case MILAGE_RATES.INTERN_LTE_200:
-      return 'Intern bis zu 200km'
-    case MILAGE_RATES.INTERN_201_1000:
-      return 'Intern 201-1.000km'
-    case MILAGE_RATES.INTERN_1001_2000:
-      return 'Intern 1.001-2.000km'
-    case MILAGE_RATES.INTERN_GTE_2001:
-      return 'Intern ab 2.001km'
-    case MILAGE_RATES.EXTERN_LTE_200:
-      return 'Extern bis zu 200km'
-    case MILAGE_RATES.EXTERN_201_1000:
-      return 'Extern 201-1.000km'
-    case MILAGE_RATES.EXTERN_1001_2000:
-      return 'Extern 1.001-2.000km'
-    case MILAGE_RATES.EXTERN_GTE_2001:
-      return 'Extern ab 2.001km'
-    case MILAGE_RATES.FREE_OF_CHARGE:
-      return 'Frei'
+function getTarifLabel(tarif: MILAGE_TARIFS) {
+  switch (tarif) {
+    case MILAGE_TARIFS.EXTERN:
+      return 'Extern'
+    case MILAGE_TARIFS.INTERN:
+      return 'Intern'
+    case MILAGE_TARIFS.NOCHARGE:
+      return 'Frei von Kosten'
     default:
       return 'Keine'
   }
@@ -98,8 +83,8 @@ async function saveBill(
     milageStart: number
     milageEnd: number
     milage?: number
-    rate: MILAGE_RATES
-    additionalCosts?: AdditionalCosts[]
+    tarif: MILAGE_TARIFS
+    additionalCosts: AdditionalCost[]
     status: BILL_STATUS
   }
 ): Promise<BillDocument> {
@@ -129,17 +114,16 @@ export default function BillPage({
     booking.bill?.milageStart || milageMax
   )
   const [milageEnd, setMilageEnd] = useState(booking.bill?.milageEnd)
-  const [rate, setRate] = useState(
-    booking.bill?.rate || MILAGE_RATES.EXTERN_LTE_200
+  const [tarif, setTarif] = useState(
+    booking.bill?.tarif || MILAGE_TARIFS.EXTERN
   )
   const [status, setStatus] = useState(booking.bill?.status)
+  const [additionalCosts, setAdditionalCosts] = useState([])
   const [storingInProgress, setStoringInProgress] = useState(false)
   const [storingError, setStoringError] = useState(null)
   const milage =
     (0 < milageStart && milageStart < milageEnd && milageEnd - milageStart) || 0
-  const total =
-    Math.round(milage && rate && milage * getMilageRateValue(rate) * 100) /
-      100 || 0
+  const total = getBillTotal({ tarif, milage, additionalCosts })
 
   // in case the props change, update the internal state
   useEffect(() => setBooking(bookingProp), [bookingProp])
@@ -154,8 +138,9 @@ export default function BillPage({
         milageStart,
         milageEnd,
         milage,
-        rate,
+        tarif,
         status,
+        additionalCosts,
       })
 
       booking.bill = bill
@@ -167,11 +152,29 @@ export default function BillPage({
     setStoringInProgress(false)
   }
 
+  const onAddAdditionalCost = function (
+    event: React.MouseEvent<HTMLButtonElement>
+  ) {
+    event.preventDefault()
+    setAdditionalCosts([...additionalCosts, { name: '', value: 0 }])
+  }
+
+  const onRemoveAdditionalCost = function (
+    event: React.MouseEvent<HTMLButtonElement>,
+    index: number
+  ) {
+    event.preventDefault()
+    setAdditionalCosts([
+      ...additionalCosts.slice(0, index),
+      ...additionalCosts.slice(index + 1),
+    ])
+  }
+
   return (
     <div className="mx-3 flex flex-col min-h-screen">
       <Header />
       <main className="flex-grow">
-        <h2 className="text-3xl">Pfadi Bussle Buchung</h2>
+        <h2 className="text-3xl">Abrechnung</h2>
         <form className="form" onSubmit={onSubmit}>
           <div>
             <strong>Buchungszeitraum:</strong>{' '}
@@ -205,10 +208,10 @@ export default function BillPage({
             <Input label="Gefahren" name="milage" readOnly value={milage} />
             <Select
               label="Rate"
-              value={rate}
-              onChange={(e) => setRate(e.target.value as MILAGE_RATES)}
+              value={tarif}
+              onChange={(e) => setTarif(e.target.value as MILAGE_TARIFS)}
             >
-              {milageRateOptions}
+              {milageTarifOptions}
             </Select>
             <Select
               label="Status"
@@ -217,7 +220,66 @@ export default function BillPage({
             >
               {bookingStatusOptions}
             </Select>
-            <Input label="Summe" name="milage" readOnly value={total} />
+            <div className="mb-3">
+              <button
+                className="ibtn btn-gray mr-3"
+                onClick={onAddAdditionalCost}
+                title="Zusätzliche Kosten hinzufügen"
+              >
+                +
+              </button>
+              <label className="flabel inline">Zusätzliche Kosten</label>
+            </div>
+            {additionalCosts.map((_, index) => {
+              return (
+                <>
+                  <div className="mb-3" key={`label${index}`}>
+                    <button
+                      className="ibtn btn-gray mr-3"
+                      onClick={(event) => onRemoveAdditionalCost(event, index)}
+                      title="Entfernen"
+                    >
+                      -
+                    </button>
+                    <label className="flabel inline">{`Kostenpunkt ${
+                      index + 1
+                    }`}</label>
+                  </div>
+                  <div className="ml-10 mb-3" key={`input{index}`}>
+                    <Input
+                      label={`Name`}
+                      name={`additionalCostName${index}`}
+                      key={`additionalCostName${index}`}
+                      value={additionalCosts[index].name}
+                      onChange={(event) => {
+                        const newAdditonalCosts = [...additionalCosts]
+                        newAdditonalCosts[index] = {
+                          value: newAdditonalCosts[index].value,
+                          name: event.target.value,
+                        }
+                        setAdditionalCosts(newAdditonalCosts)
+                      }}
+                    />
+                    <Input
+                      label={`Betrag`}
+                      name={`additionalCostValue${index}`}
+                      key={`additionalCostValue${index}`}
+                      value={additionalCosts[index].value}
+                      type="number"
+                      onChange={(event) => {
+                        const newAdditonalCosts = [...additionalCosts]
+                        newAdditonalCosts[index] = {
+                          name: newAdditonalCosts[index].name,
+                          value: Number(event.target.value),
+                        }
+                        setAdditionalCosts(newAdditonalCosts)
+                      }}
+                    />
+                  </div>
+                </>
+              )
+            })}
+            <Input label="Summe" name="total" readOnly value={total} />
           </div>
           {storingError && (
             <div className="error-message flex-grow">{storingError}</div>
diff --git a/pages/booking/[uuid]/index.tsx b/pages/booking/[uuid]/index.tsx
index a018bf3..d8c2a81 100644
--- a/pages/booking/[uuid]/index.tsx
+++ b/pages/booking/[uuid]/index.tsx
@@ -94,7 +94,7 @@ export default function ShowBooking({
     <div className="mx-3 flex flex-col min-h-screen">
       <Header />
       <main className="flex-grow">
-        <h2 className="text-3xl">Ihre Pfadi Bussle Buchung</h2>
+        <h2 className="text-3xl">Ihre Buchung</h2>
         <div>
           <strong>Buchungsstatus:</strong> {getBookingStatus(booking)}
         </div>
diff --git a/styles/index.css b/styles/index.css
index 6aa7a31..12490f1 100644
--- a/styles/index.css
+++ b/styles/index.css
@@ -60,7 +60,7 @@
 }
 
 .ibtn {
-  @apply py-2 px-2 text-gray-400 w-10 h-10;
+  @apply p-1 text-gray-400 text-xs w-6 h-6 rounded;
 }
 
 .ibtn:hover {