diff --git a/internal/api/httpinvoce/controller.go b/internal/api/httpinvoce/controller.go
index 302f149..7d27d40 100644
--- a/internal/api/httpinvoce/controller.go
+++ b/internal/api/httpinvoce/controller.go
@@ -31,6 +31,7 @@ func (s Service) createInvoice(w http.ResponseWriter, r *http.Request) {
 
 	opts := invoice.DefaultOptions
 	opts.Mindur = time.Duration(req.DurationThreshold)
+	opts.CustomTemplate = req.CustomTemplate
 	invoice, report, err := s.invoice.Generate(req.Creditor, &req.Debtor, req.HourlyRate, repos, &opts)
 	if err != nil {
 		s.sendErr(w, http.StatusInternalServerError, "internal server error")
@@ -71,6 +72,7 @@ func (s Service) sendInvoice(w http.ResponseWriter, r *http.Request) {
 
 	opts := invoice.DefaultOptions
 	opts.Mindur = time.Duration(req.Invoice.DurationThreshold)
+	opts.CustomTemplate = req.Invoice.CustomTemplate
 	invoice, report, err := s.invoice.Generate(req.Invoice.Creditor, &req.Invoice.Debtor, req.Invoice.HourlyRate, repos, &opts)
 	if err != nil {
 		s.sendErr(w, http.StatusInternalServerError, "error while processing invoice:", err)
diff --git a/internal/api/httpinvoce/controller_test.go b/internal/api/httpinvoce/controller_test.go
index 7335ec7..a4a5f8a 100644
--- a/internal/api/httpinvoce/controller_test.go
+++ b/internal/api/httpinvoce/controller_test.go
@@ -65,14 +65,14 @@ func (s SendReq) ToEMail() email.Mail {
 
 // MockInvoiceService mocks the invoice.Service interface
 type MockInvoiceService struct {
-	GenerateFunc func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, *report.Report, error)
+	GenerateFunc func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, report.Report, error)
 }
 
-func (m *MockInvoiceService) Generate(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, *report.Report, error) {
+func (m *MockInvoiceService) Generate(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, report.Report, error) {
 	if m.GenerateFunc != nil {
 		return m.GenerateFunc(creditor, debtor, hourlyRate, repos, opts)
 	}
-	return nil, &report.Report{}, nil
+	return nil, report.Report{}, nil
 }
 
 // MockEmailService mocks the email.Service interface
@@ -94,7 +94,7 @@ func TestCreateInvoice(t *testing.T) {
 	tests := []struct {
 		name           string
 		requestBody    InvoiceReq
-		mockGenerate   func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error)
+		mockGenerate   func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error)
 		expectedStatus int
 		expectedBody   string // For error messages or specific content
 	}{
@@ -107,7 +107,7 @@ func TestCreateInvoice(t *testing.T) {
 				HourlyRate:        100,
 				Repos:             []string{"owner/repo1"},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
 				pdfContent := "mock PDF content"
 				// Create a report with a positive total duration
 				mockReport := report.New([]issue.Issue{{Duration: time.Hour}}, model.Entity{}, &model.Entity{}, 0)
@@ -138,8 +138,8 @@ func TestCreateInvoice(t *testing.T) {
 				HourlyRate:        100,
 				Repos:             []string{"owner/repo1"},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
-				return nil, nil, errors.New("failed to generate invoice")
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
+				return nil, report.Report{}, errors.New("failed to generate invoice")
 			},
 			expectedStatus: http.StatusInternalServerError,
 			expectedBody:   "internal server error",
@@ -153,7 +153,7 @@ func TestCreateInvoice(t *testing.T) {
 				HourlyRate:        100,
 				Repos:             []string{"owner/repo1"},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
 				// Create a report with zero total duration
 				mockReport := report.New([]issue.Issue{}, model.Entity{}, &model.Entity{}, 0)
 				return io.NopCloser(bytes.NewReader([]byte("mock PDF content"))), mockReport, nil
@@ -166,7 +166,7 @@ func TestCreateInvoice(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			mockInvoiceService := &MockInvoiceService{
-				GenerateFunc: func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, *report.Report, error) {
+				GenerateFunc: func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, report.Report, error) {
 					if opts == nil {
 						opts = &invoice.DefaultOptions
 					}
@@ -201,7 +201,7 @@ func TestSendInvoice(t *testing.T) {
 	tests := []struct {
 		name           string
 		requestBody    SendReq
-		mockGenerate   func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error)
+		mockGenerate   func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error)
 		mockSend       func(mail email.Mail) error
 		expectedStatus int
 		expectedBody   string
@@ -220,7 +220,7 @@ func TestSendInvoice(t *testing.T) {
 					Repos:             []string{"owner/repo1"},
 				},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
 				pdfContent := "mock PDF content for send"
 				mockReport := report.New([]issue.Issue{{Duration: time.Hour}}, model.Entity{}, &model.Entity{}, 0)
 				return io.NopCloser(bytes.NewReader([]byte(pdfContent))), mockReport, nil
@@ -245,8 +245,8 @@ func TestSendInvoice(t *testing.T) {
 					Repos:             []string{"owner/repo1"},
 				},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
-				return nil, nil, errors.New("failed to generate invoice for send")
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
+				return nil, report.Report{}, errors.New("failed to generate invoice for send")
 			},
 			mockSend:       nil, // Not called
 			expectedStatus: http.StatusInternalServerError,
@@ -266,7 +266,7 @@ func TestSendInvoice(t *testing.T) {
 					Repos:             []string{"owner/repo1"},
 				},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
 				pdfContent := "mock PDF content for send"
 				mockReport := report.New([]issue.Issue{{Duration: time.Hour}}, model.Entity{}, &model.Entity{}, 0)
 				return io.NopCloser(bytes.NewReader([]byte(pdfContent))), mockReport, nil
@@ -291,7 +291,7 @@ func TestSendInvoice(t *testing.T) {
 					Repos:             []string{"owner/repo1"},
 				},
 			},
-			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, *report.Report, error) {
+			mockGenerate: func(creditor model.Entity, debtor *model.Entity, durationThreshold time.Duration, hourlyRate float64, repos []invoice.Repo) (io.ReadCloser, report.Report, error) {
 				mockReport := report.New([]issue.Issue{}, model.Entity{}, &model.Entity{}, 0)
 				return io.NopCloser(bytes.NewReader([]byte("mock PDF content"))), mockReport, nil
 			},
@@ -303,7 +303,7 @@ func TestSendInvoice(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			mockInvoiceService := &MockInvoiceService{
-				GenerateFunc: func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, *report.Report, error) {
+				GenerateFunc: func(creditor model.Entity, debtor *model.Entity, hourlyRate float64, repos []invoice.Repo, opts *invoice.Options) (io.ReadCloser, report.Report, error) {
 					if opts == nil {
 						opts = &invoice.DefaultOptions
 					}
diff --git a/internal/api/httpinvoce/model.go b/internal/api/httpinvoce/model.go
index 6312c21..bb29981 100644
--- a/internal/api/httpinvoce/model.go
+++ b/internal/api/httpinvoce/model.go
@@ -18,6 +18,7 @@ type invoiceReq struct {
 	DurationThreshold jtype.Duration `json:"durationThreshold"`
 	HourlyRate        float64        `json:"hourlyRate"`
 	Repos             []string       `json:"repositories"`
+	CustomTemplate    string         `json:"template,omitempty"`
 }
 
 func (i invoiceReq) GetRepos() (repos []invoice.Repo, err error) {
diff --git a/internal/api/httpinvoce/resource.go b/internal/api/httpinvoce/resource.go
index 0d8c69b..cf4b823 100644
--- a/internal/api/httpinvoce/resource.go
+++ b/internal/api/httpinvoce/resource.go
@@ -21,7 +21,7 @@ func New(log *slog.Logger, invoice invoicer, mail mailer) *Service {
 }
 
 type invoicer interface {
-	Generate(creditor model.Entity, deptor *model.Entity, rate float64, repos []invoice.Repo, opts *invoice.Options) (document io.ReadCloser, report *report.Report, err error)
+	Generate(creditor model.Entity, deptor *model.Entity, rate float64, repos []invoice.Repo, opts *invoice.Options) (document io.ReadCloser, report report.Report, err error)
 }
 
 type mailer interface {
diff --git a/pkg/invoice/invoice.go b/pkg/invoice/invoice.go
index 65e34d3..e707da0 100644
--- a/pkg/invoice/invoice.go
+++ b/pkg/invoice/invoice.go
@@ -9,7 +9,7 @@ import (
 	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/report"
 )
 
-func (s *Service) Generate(creditor model.Entity, deptor *model.Entity, rate float64, repos []Repo, config *Options) (document io.ReadCloser, r *report.Report, err error) {
+func (s *Service) Generate(creditor model.Entity, deptor *model.Entity, rate float64, repos []Repo, config *Options) (document io.ReadCloser, r report.Report, err error) {
 	if config == nil {
 		config = &DefaultOptions
 	}
@@ -26,7 +26,7 @@ func (s *Service) Generate(creditor model.Entity, deptor *model.Entity, rate flo
 			},
 		)
 		if err != nil {
-			return nil, nil, err
+			return nil, r, err
 		}
 
 		is = append(is, iss...)
@@ -40,6 +40,10 @@ func (s *Service) Generate(creditor model.Entity, deptor *model.Entity, rate flo
 		deptor,
 		rate,
 	)
+
+	if len(config.CustomTemplate) > 1 {
+		r = r.WithTemplate(config.CustomTemplate)
+	}
 	html, err := r.ToHTML()
 	if err != nil {
 		return document, r, err
diff --git a/pkg/invoice/report/assets/style.css b/pkg/invoice/report/assets/style.css
index 760fdc8..5d3aa36 100644
--- a/pkg/invoice/report/assets/style.css
+++ b/pkg/invoice/report/assets/style.css
@@ -1,6 +1,6 @@
 .markdown h1 {
-  font-size: 2.25em;     /* relative to base 12pt */
-  font-weight: 700;      /* font-bold */
+  font-size: 2.25em; /* relative to base 12pt */
+  font-weight: 700; /* font-bold */
   margin-top: 1.5em;
   margin-bottom: 1em;
 }
@@ -49,8 +49,10 @@
 
 .markdown code {
   background-color: #f3f4f6;
-  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
-  font-size: 0.875em;  /* relative to base 12pt */
+  font-family:
+    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
+    "Courier New", monospace;
+  font-size: 0.875em; /* relative to base 12pt */
   padding: 0.125em 0.25em;
   border-radius: 0.25em;
 }
@@ -58,7 +60,9 @@
 .markdown pre {
   background-color: #111827;
   color: #f3f4f6;
-  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-family:
+    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
+    "Courier New", monospace;
   font-size: 0.875em;
   padding: 1em;
   border-radius: 0.5em;
@@ -135,5 +139,3 @@
   padding-left: 1.5em;
   margin-top: 0.25em;
 }
-</style>
-
diff --git a/pkg/invoice/report/resource.go b/pkg/invoice/report/resource.go
index c918351..4741cef 100644
--- a/pkg/invoice/report/resource.go
+++ b/pkg/invoice/report/resource.go
@@ -3,29 +3,41 @@ package report
 import (
 	"time"
 
+	_ "embed"
+
 	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/issue"
 	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/model"
 	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/report/qrbill"
 )
 
+//go:embed assets/template.html
+var htmlTemplate string
+
 type Report struct {
-	Date    time.Time
-	Issues  []issue.Issue
-	Invoice qrbill.Invoice
-	Rate    float64
-	Company model.Entity
-	Client  *model.Entity
+	Date     time.Time
+	Issues   []issue.Issue
+	Invoice  qrbill.Invoice
+	Rate     float64
+	Company  model.Entity
+	Client   *model.Entity
+	template string
 }
 
-func New(issues []issue.Issue, company model.Entity, client *model.Entity, rate float64) *Report {
-	r := &Report{
-		Date:    time.Now(),
-		Issues:  issues,
-		Rate:    rate,
-		Company: company,
-		Client:  client,
+func New(issues []issue.Issue, company model.Entity, client *model.Entity, rate float64) Report {
+	r := Report{
+		Date:     time.Now(),
+		Issues:   issues,
+		Rate:     rate,
+		Company:  company,
+		Client:   client,
+		template: htmlTemplate,
 	}
 	r.Invoice = qrbill.New(r.applyRate(r.Total()), r.Company, r.Client)
 
 	return r
 }
+
+func (r Report) WithTemplate(template string) Report {
+	r.template = template
+	return r
+}
diff --git a/pkg/invoice/report/template.go b/pkg/invoice/report/template.go
index 24d0407..679f50e 100644
--- a/pkg/invoice/report/template.go
+++ b/pkg/invoice/report/template.go
@@ -9,9 +9,6 @@ import (
 	"time"
 )
 
-//go:embed assets/template.html
-var htmlTemplate string
-
 //go:embed assets/style.css
 var style template.CSS
 
@@ -33,7 +30,7 @@ func (r Report) ToHTML() (html string, err error) {
 			"time":     fmtDateTime,
 			"date":     fmtDate,
 			"duration": fmtDuration,
-		}).Parse(htmlTemplate))
+		}).Parse(r.template))
 
 	buf := new(bytes.Buffer)
 
diff --git a/pkg/invoice/resource.go b/pkg/invoice/resource.go
index 1073067..ba6de29 100644
--- a/pkg/invoice/resource.go
+++ b/pkg/invoice/resource.go
@@ -16,14 +16,16 @@ var DefaultOptions = Options{
 	IssueFilter: func(i *gitea.Issue) bool {
 		return i.Closed != nil && i.Closed.After(time.Now().AddDate(0, -1, 0))
 	},
+	CustomTemplate: "",
 }
 
 type Options struct {
-	Mindur      time.Duration
-	Since       time.Time
-	Before      time.Time
-	IssueState  gitea.StateType
-	IssueFilter func(i *gitea.Issue) bool
+	Mindur         time.Duration
+	Since          time.Time
+	Before         time.Time
+	IssueState     gitea.StateType
+	IssueFilter    func(i *gitea.Issue) bool
+	CustomTemplate string // if the length of the CustomTemplate is longer than 0, it get's used
 }
 
 type Repo struct {